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-rw-r--r--vendor/thiserror-impl/.cargo-checksum.json1
-rw-r--r--vendor/thiserror-impl/Cargo.lock47
-rw-r--r--vendor/thiserror-impl/Cargo.toml51
-rw-r--r--vendor/thiserror-impl/LICENSE-APACHE176
-rw-r--r--vendor/thiserror-impl/LICENSE-MIT23
-rw-r--r--vendor/thiserror-impl/src/ast.rs185
-rw-r--r--vendor/thiserror-impl/src/attr.rs358
-rw-r--r--vendor/thiserror-impl/src/expand.rs583
-rw-r--r--vendor/thiserror-impl/src/fallback.rs32
-rw-r--r--vendor/thiserror-impl/src/fmt.rs322
-rw-r--r--vendor/thiserror-impl/src/generics.rs83
-rw-r--r--vendor/thiserror-impl/src/lib.rs39
-rw-r--r--vendor/thiserror-impl/src/prop.rs148
-rw-r--r--vendor/thiserror-impl/src/scan_expr.rs264
-rw-r--r--vendor/thiserror-impl/src/unraw.rs142
-rw-r--r--vendor/thiserror-impl/src/valid.rs248
16 files changed, 2702 insertions, 0 deletions
diff --git a/vendor/thiserror-impl/.cargo-checksum.json b/vendor/thiserror-impl/.cargo-checksum.json
new file mode 100644
index 00000000..4352adc3
--- /dev/null
+++ b/vendor/thiserror-impl/.cargo-checksum.json
@@ -0,0 +1 @@
+{"files":{"Cargo.lock":"a4ccfef62250083ba68dbfc29872a4c03a5a81a0b37d8b3523e5d6b566564672","Cargo.toml":"4cdb56333675df024c3c9980713aff1aa76f50aafb72dc87357c43a531058496","LICENSE-APACHE":"62c7a1e35f56406896d7aa7ca52d0cc0d272ac022b5d2796e7d6905db8a3636a","LICENSE-MIT":"23f18e03dc49df91622fe2a76176497404e46ced8a715d9d2b67a7446571cca3","src/ast.rs":"c717fffeb2923b2840d58fd02923a1926a48fa8336039f57a9e94f9275ae7ec6","src/attr.rs":"d3c7fa9e8269973f140e5382f753664ac32bee44c09875f678100b890aea4d06","src/expand.rs":"9169c10d622028ee6aab960e73a510a09ddc0a93817ee5850ef1ea64ccbddced","src/fallback.rs":"505c5a56a07a8a25bf533b44111e44a85e13b9dac787f24f2191e3d7389db446","src/fmt.rs":"e6391502143c44b9f04cdef9085a84392804bdde75d8b87d741fded7f7882c7a","src/generics.rs":"03134b3882790f657a11700e5fb0b0ca744214a47d609febaabc14926d2d7e03","src/lib.rs":"8ddbfd56670c3a508fd13f2f44d80782aac760f6a32db0a57af3c2c9ef27dd26","src/prop.rs":"82fb29bd85b0e1163c32dca2ff874e1dfbece7f681b986c6fe618f29e34bdd26","src/scan_expr.rs":"d46ae7a3eaaa6476553db3164676ec71aa82bcd8a2e4cad59deb07893c79f1c8","src/unraw.rs":"d4ee6048f7722160c3d61f69378d2c8d17068a319a8e6a33c6f25ea673e88312","src/valid.rs":"5a4e781773cc9a2f3129f620fa4f201f71fd3265b8315ca138239bec3bf618fb"},"package":"7f7cf42b4507d8ea322120659672cf1b9dbb93f8f2d4ecfd6e51350ff5b17a1d"} \ No newline at end of file
diff --git a/vendor/thiserror-impl/Cargo.lock b/vendor/thiserror-impl/Cargo.lock
new file mode 100644
index 00000000..17f093e2
--- /dev/null
+++ b/vendor/thiserror-impl/Cargo.lock
@@ -0,0 +1,47 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.93"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "60946a68e5f9d28b0dc1c21bb8a97ee7d018a8b322fa57838ba31cc878e22d99"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.38"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0e4dccaaaf89514f546c693ddc140f729f958c247918a13380cccc6078391acc"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "syn"
+version = "2.0.98"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "36147f1a48ae0ec2b5b3bc5b537d267457555a10dc06f3dbc8cb11ba3006d3b1"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "2.0.12"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "00e2473a93778eb0bad35909dff6a10d28e63f792f16ed15e404fca9d5eeedbe"
diff --git a/vendor/thiserror-impl/Cargo.toml b/vendor/thiserror-impl/Cargo.toml
new file mode 100644
index 00000000..28e890cc
--- /dev/null
+++ b/vendor/thiserror-impl/Cargo.toml
@@ -0,0 +1,51 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2021"
+rust-version = "1.61"
+name = "thiserror-impl"
+version = "2.0.12"
+authors = ["David Tolnay <dtolnay@gmail.com>"]
+build = false
+autolib = false
+autobins = false
+autoexamples = false
+autotests = false
+autobenches = false
+description = "Implementation detail of the `thiserror` crate"
+readme = false
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/dtolnay/thiserror"
+
+[package.metadata.docs.rs]
+rustdoc-args = [
+ "--generate-link-to-definition",
+ "--extern-html-root-url=core=https://doc.rust-lang.org",
+ "--extern-html-root-url=alloc=https://doc.rust-lang.org",
+ "--extern-html-root-url=std=https://doc.rust-lang.org",
+ "--extern-html-root-url=proc_macro=https://doc.rust-lang.org",
+]
+targets = ["x86_64-unknown-linux-gnu"]
+
+[lib]
+name = "thiserror_impl"
+path = "src/lib.rs"
+proc-macro = true
+
+[dependencies.proc-macro2]
+version = "1.0.74"
+
+[dependencies.quote]
+version = "1.0.35"
+
+[dependencies.syn]
+version = "2.0.87"
diff --git a/vendor/thiserror-impl/LICENSE-APACHE b/vendor/thiserror-impl/LICENSE-APACHE
new file mode 100644
index 00000000..1b5ec8b7
--- /dev/null
+++ b/vendor/thiserror-impl/LICENSE-APACHE
@@ -0,0 +1,176 @@
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
+ "License" shall mean the terms and conditions for use, reproduction,
+ and distribution as defined by Sections 1 through 9 of this document.
+
+ "Licensor" shall mean the copyright owner or entity authorized by
+ the copyright owner that is granting the License.
+
+ "Legal Entity" shall mean the union of the acting entity and all
+ other entities that control, are controlled by, or are under common
+ control with that entity. For the purposes of this definition,
+ "control" means (i) the power, direct or indirect, to cause the
+ direction or management of such entity, whether by contract or
+ otherwise, or (ii) ownership of fifty percent (50%) or more of the
+ outstanding shares, or (iii) beneficial ownership of such entity.
+
+ "You" (or "Your") shall mean an individual or Legal Entity
+ exercising permissions granted by this License.
+
+ "Source" form shall mean the preferred form for making modifications,
+ including but not limited to software source code, documentation
+ source, and configuration files.
+
+ "Object" form shall mean any form resulting from mechanical
+ transformation or translation of a Source form, including but
+ not limited to compiled object code, generated documentation,
+ and conversions to other media types.
+
+ "Work" shall mean the work of authorship, whether in Source or
+ Object form, made available under the License, as indicated by a
+ copyright notice that is included in or attached to the work
+ (an example is provided in the Appendix below).
+
+ "Derivative Works" shall mean any work, whether in Source or Object
+ form, that is based on (or derived from) the Work and for which the
+ editorial revisions, annotations, elaborations, or other modifications
+ represent, as a whole, an original work of authorship. For the purposes
+ of this License, Derivative Works shall not include works that remain
+ separable from, or merely link (or bind by name) to the interfaces of,
+ the Work and Derivative Works thereof.
+
+ "Contribution" shall mean any work of authorship, including
+ the original version of the Work and any modifications or additions
+ to that Work or Derivative Works thereof, that is intentionally
+ submitted to Licensor for inclusion in the Work by the copyright owner
+ or by an individual or Legal Entity authorized to submit on behalf of
+ the copyright owner. For the purposes of this definition, "submitted"
+ means any form of electronic, verbal, or written communication sent
+ to the Licensor or its representatives, including but not limited to
+ communication on electronic mailing lists, source code control systems,
+ and issue tracking systems that are managed by, or on behalf of, the
+ Licensor for the purpose of discussing and improving the Work, but
+ excluding communication that is conspicuously marked or otherwise
+ designated in writing by the copyright owner as "Not a Contribution."
+
+ "Contributor" shall mean Licensor and any individual or Legal Entity
+ on behalf of whom a Contribution has been received by Licensor and
+ subsequently incorporated within the Work.
+
+2. Grant of Copyright License. Subject to the terms and conditions of
+ this License, each Contributor hereby grants to You a perpetual,
+ worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+ copyright license to reproduce, prepare Derivative Works of,
+ publicly display, publicly perform, sublicense, and distribute the
+ Work and such Derivative Works in Source or Object form.
+
+3. Grant of Patent License. Subject to the terms and conditions of
+ this License, each Contributor hereby grants to You a perpetual,
+ worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+ (except as stated in this section) patent license to make, have made,
+ use, offer to sell, sell, import, and otherwise transfer the Work,
+ where such license applies only to those patent claims licensable
+ by such Contributor that are necessarily infringed by their
+ Contribution(s) alone or by combination of their Contribution(s)
+ with the Work to which such Contribution(s) was submitted. If You
+ institute patent litigation against any entity (including a
+ cross-claim or counterclaim in a lawsuit) alleging that the Work
+ or a Contribution incorporated within the Work constitutes direct
+ or contributory patent infringement, then any patent licenses
+ granted to You under this License for that Work shall terminate
+ as of the date such litigation is filed.
+
+4. Redistribution. You may reproduce and distribute copies of the
+ Work or Derivative Works thereof in any medium, with or without
+ modifications, and in Source or Object form, provided that You
+ meet the following conditions:
+
+ (a) You must give any other recipients of the Work or
+ Derivative Works a copy of this License; and
+
+ (b) You must cause any modified files to carry prominent notices
+ stating that You changed the files; and
+
+ (c) You must retain, in the Source form of any Derivative Works
+ that You distribute, all copyright, patent, trademark, and
+ attribution notices from the Source form of the Work,
+ excluding those notices that do not pertain to any part of
+ the Derivative Works; and
+
+ (d) If the Work includes a "NOTICE" text file as part of its
+ distribution, then any Derivative Works that You distribute must
+ include a readable copy of the attribution notices contained
+ within such NOTICE file, excluding those notices that do not
+ pertain to any part of the Derivative Works, in at least one
+ of the following places: within a NOTICE text file distributed
+ as part of the Derivative Works; within the Source form or
+ documentation, if provided along with the Derivative Works; or,
+ within a display generated by the Derivative Works, if and
+ wherever such third-party notices normally appear. The contents
+ of the NOTICE file are for informational purposes only and
+ do not modify the License. You may add Your own attribution
+ notices within Derivative Works that You distribute, alongside
+ or as an addendum to the NOTICE text from the Work, provided
+ that such additional attribution notices cannot be construed
+ as modifying the License.
+
+ You may add Your own copyright statement to Your modifications and
+ may provide additional or different license terms and conditions
+ for use, reproduction, or distribution of Your modifications, or
+ for any such Derivative Works as a whole, provided Your use,
+ reproduction, and distribution of the Work otherwise complies with
+ the conditions stated in this License.
+
+5. Submission of Contributions. Unless You explicitly state otherwise,
+ any Contribution intentionally submitted for inclusion in the Work
+ by You to the Licensor shall be under the terms and conditions of
+ this License, without any additional terms or conditions.
+ Notwithstanding the above, nothing herein shall supersede or modify
+ the terms of any separate license agreement you may have executed
+ with Licensor regarding such Contributions.
+
+6. Trademarks. This License does not grant permission to use the trade
+ names, trademarks, service marks, or product names of the Licensor,
+ except as required for reasonable and customary use in describing the
+ origin of the Work and reproducing the content of the NOTICE file.
+
+7. Disclaimer of Warranty. Unless required by applicable law or
+ agreed to in writing, Licensor provides the Work (and each
+ Contributor provides its Contributions) on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ implied, including, without limitation, any warranties or conditions
+ of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+ PARTICULAR PURPOSE. You are solely responsible for determining the
+ appropriateness of using or redistributing the Work and assume any
+ risks associated with Your exercise of permissions under this License.
+
+8. Limitation of Liability. In no event and under no legal theory,
+ whether in tort (including negligence), contract, or otherwise,
+ unless required by applicable law (such as deliberate and grossly
+ negligent acts) or agreed to in writing, shall any Contributor be
+ liable to You for damages, including any direct, indirect, special,
+ incidental, or consequential damages of any character arising as a
+ result of this License or out of the use or inability to use the
+ Work (including but not limited to damages for loss of goodwill,
+ work stoppage, computer failure or malfunction, or any and all
+ other commercial damages or losses), even if such Contributor
+ has been advised of the possibility of such damages.
+
+9. Accepting Warranty or Additional Liability. While redistributing
+ the Work or Derivative Works thereof, You may choose to offer,
+ and charge a fee for, acceptance of support, warranty, indemnity,
+ or other liability obligations and/or rights consistent with this
+ License. However, in accepting such obligations, You may act only
+ on Your own behalf and on Your sole responsibility, not on behalf
+ of any other Contributor, and only if You agree to indemnify,
+ defend, and hold each Contributor harmless for any liability
+ incurred by, or claims asserted against, such Contributor by reason
+ of your accepting any such warranty or additional liability.
+
+END OF TERMS AND CONDITIONS
diff --git a/vendor/thiserror-impl/LICENSE-MIT b/vendor/thiserror-impl/LICENSE-MIT
new file mode 100644
index 00000000..31aa7938
--- /dev/null
+++ b/vendor/thiserror-impl/LICENSE-MIT
@@ -0,0 +1,23 @@
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/vendor/thiserror-impl/src/ast.rs b/vendor/thiserror-impl/src/ast.rs
new file mode 100644
index 00000000..77f95837
--- /dev/null
+++ b/vendor/thiserror-impl/src/ast.rs
@@ -0,0 +1,185 @@
+use crate::attr::{self, Attrs};
+use crate::generics::ParamsInScope;
+use crate::unraw::{IdentUnraw, MemberUnraw};
+use proc_macro2::Span;
+use std::fmt::{self, Display};
+use syn::{
+ Data, DataEnum, DataStruct, DeriveInput, Error, Fields, Generics, Ident, Index, Result, Type,
+};
+
+pub enum Input<'a> {
+ Struct(Struct<'a>),
+ Enum(Enum<'a>),
+}
+
+pub struct Struct<'a> {
+ pub attrs: Attrs<'a>,
+ pub ident: Ident,
+ pub generics: &'a Generics,
+ pub fields: Vec<Field<'a>>,
+}
+
+pub struct Enum<'a> {
+ pub attrs: Attrs<'a>,
+ pub ident: Ident,
+ pub generics: &'a Generics,
+ pub variants: Vec<Variant<'a>>,
+}
+
+pub struct Variant<'a> {
+ pub original: &'a syn::Variant,
+ pub attrs: Attrs<'a>,
+ pub ident: Ident,
+ pub fields: Vec<Field<'a>>,
+}
+
+pub struct Field<'a> {
+ pub original: &'a syn::Field,
+ pub attrs: Attrs<'a>,
+ pub member: MemberUnraw,
+ pub ty: &'a Type,
+ pub contains_generic: bool,
+}
+
+#[derive(Copy, Clone)]
+pub enum ContainerKind {
+ Struct,
+ TupleStruct,
+ UnitStruct,
+ StructVariant,
+ TupleVariant,
+ UnitVariant,
+}
+
+impl<'a> Input<'a> {
+ pub fn from_syn(node: &'a DeriveInput) -> Result<Self> {
+ match &node.data {
+ Data::Struct(data) => Struct::from_syn(node, data).map(Input::Struct),
+ Data::Enum(data) => Enum::from_syn(node, data).map(Input::Enum),
+ Data::Union(_) => Err(Error::new_spanned(
+ node,
+ "union as errors are not supported",
+ )),
+ }
+ }
+}
+
+impl<'a> Struct<'a> {
+ fn from_syn(node: &'a DeriveInput, data: &'a DataStruct) -> Result<Self> {
+ let mut attrs = attr::get(&node.attrs)?;
+ let scope = ParamsInScope::new(&node.generics);
+ let fields = Field::multiple_from_syn(&data.fields, &scope)?;
+ if let Some(display) = &mut attrs.display {
+ let container = ContainerKind::from_struct(data);
+ display.expand_shorthand(&fields, container)?;
+ }
+ Ok(Struct {
+ attrs,
+ ident: node.ident.clone(),
+ generics: &node.generics,
+ fields,
+ })
+ }
+}
+
+impl<'a> Enum<'a> {
+ fn from_syn(node: &'a DeriveInput, data: &'a DataEnum) -> Result<Self> {
+ let attrs = attr::get(&node.attrs)?;
+ let scope = ParamsInScope::new(&node.generics);
+ let variants = data
+ .variants
+ .iter()
+ .map(|node| {
+ let mut variant = Variant::from_syn(node, &scope)?;
+ if variant.attrs.display.is_none()
+ && variant.attrs.transparent.is_none()
+ && variant.attrs.fmt.is_none()
+ {
+ variant.attrs.display.clone_from(&attrs.display);
+ variant.attrs.transparent = attrs.transparent;
+ variant.attrs.fmt.clone_from(&attrs.fmt);
+ }
+ if let Some(display) = &mut variant.attrs.display {
+ let container = ContainerKind::from_variant(node);
+ display.expand_shorthand(&variant.fields, container)?;
+ }
+ Ok(variant)
+ })
+ .collect::<Result<_>>()?;
+ Ok(Enum {
+ attrs,
+ ident: node.ident.clone(),
+ generics: &node.generics,
+ variants,
+ })
+ }
+}
+
+impl<'a> Variant<'a> {
+ fn from_syn(node: &'a syn::Variant, scope: &ParamsInScope<'a>) -> Result<Self> {
+ let attrs = attr::get(&node.attrs)?;
+ Ok(Variant {
+ original: node,
+ attrs,
+ ident: node.ident.clone(),
+ fields: Field::multiple_from_syn(&node.fields, scope)?,
+ })
+ }
+}
+
+impl<'a> Field<'a> {
+ fn multiple_from_syn(fields: &'a Fields, scope: &ParamsInScope<'a>) -> Result<Vec<Self>> {
+ fields
+ .iter()
+ .enumerate()
+ .map(|(i, field)| Field::from_syn(i, field, scope))
+ .collect()
+ }
+
+ fn from_syn(i: usize, node: &'a syn::Field, scope: &ParamsInScope<'a>) -> Result<Self> {
+ Ok(Field {
+ original: node,
+ attrs: attr::get(&node.attrs)?,
+ member: match &node.ident {
+ Some(name) => MemberUnraw::Named(IdentUnraw::new(name.clone())),
+ None => MemberUnraw::Unnamed(Index {
+ index: i as u32,
+ span: Span::call_site(),
+ }),
+ },
+ ty: &node.ty,
+ contains_generic: scope.intersects(&node.ty),
+ })
+ }
+}
+
+impl ContainerKind {
+ fn from_struct(node: &DataStruct) -> Self {
+ match node.fields {
+ Fields::Named(_) => ContainerKind::Struct,
+ Fields::Unnamed(_) => ContainerKind::TupleStruct,
+ Fields::Unit => ContainerKind::UnitStruct,
+ }
+ }
+
+ fn from_variant(node: &syn::Variant) -> Self {
+ match node.fields {
+ Fields::Named(_) => ContainerKind::StructVariant,
+ Fields::Unnamed(_) => ContainerKind::TupleVariant,
+ Fields::Unit => ContainerKind::UnitVariant,
+ }
+ }
+}
+
+impl Display for ContainerKind {
+ fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+ formatter.write_str(match self {
+ ContainerKind::Struct => "struct",
+ ContainerKind::TupleStruct => "tuple struct",
+ ContainerKind::UnitStruct => "unit struct",
+ ContainerKind::StructVariant => "struct variant",
+ ContainerKind::TupleVariant => "tuple variant",
+ ContainerKind::UnitVariant => "unit variant",
+ })
+ }
+}
diff --git a/vendor/thiserror-impl/src/attr.rs b/vendor/thiserror-impl/src/attr.rs
new file mode 100644
index 00000000..7ad83e02
--- /dev/null
+++ b/vendor/thiserror-impl/src/attr.rs
@@ -0,0 +1,358 @@
+use proc_macro2::{Delimiter, Group, Literal, Punct, Spacing, Span, TokenStream, TokenTree};
+use quote::{format_ident, quote, quote_spanned, ToTokens};
+use std::collections::BTreeSet as Set;
+use syn::parse::discouraged::Speculative;
+use syn::parse::{End, ParseStream};
+use syn::{
+ braced, bracketed, parenthesized, token, Attribute, Error, ExprPath, Ident, Index, LitFloat,
+ LitInt, LitStr, Meta, Result, Token,
+};
+
+pub struct Attrs<'a> {
+ pub display: Option<Display<'a>>,
+ pub source: Option<Source<'a>>,
+ pub backtrace: Option<&'a Attribute>,
+ pub from: Option<From<'a>>,
+ pub transparent: Option<Transparent<'a>>,
+ pub fmt: Option<Fmt<'a>>,
+}
+
+#[derive(Clone)]
+pub struct Display<'a> {
+ pub original: &'a Attribute,
+ pub fmt: LitStr,
+ pub args: TokenStream,
+ pub requires_fmt_machinery: bool,
+ pub has_bonus_display: bool,
+ pub infinite_recursive: bool,
+ pub implied_bounds: Set<(usize, Trait)>,
+ pub bindings: Vec<(Ident, TokenStream)>,
+}
+
+#[derive(Copy, Clone)]
+pub struct Source<'a> {
+ pub original: &'a Attribute,
+ pub span: Span,
+}
+
+#[derive(Copy, Clone)]
+pub struct From<'a> {
+ pub original: &'a Attribute,
+ pub span: Span,
+}
+
+#[derive(Copy, Clone)]
+pub struct Transparent<'a> {
+ pub original: &'a Attribute,
+ pub span: Span,
+}
+
+#[derive(Clone)]
+pub struct Fmt<'a> {
+ pub original: &'a Attribute,
+ pub path: ExprPath,
+}
+
+#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Debug)]
+pub enum Trait {
+ Debug,
+ Display,
+ Octal,
+ LowerHex,
+ UpperHex,
+ Pointer,
+ Binary,
+ LowerExp,
+ UpperExp,
+}
+
+pub fn get(input: &[Attribute]) -> Result<Attrs> {
+ let mut attrs = Attrs {
+ display: None,
+ source: None,
+ backtrace: None,
+ from: None,
+ transparent: None,
+ fmt: None,
+ };
+
+ for attr in input {
+ if attr.path().is_ident("error") {
+ parse_error_attribute(&mut attrs, attr)?;
+ } else if attr.path().is_ident("source") {
+ attr.meta.require_path_only()?;
+ if attrs.source.is_some() {
+ return Err(Error::new_spanned(attr, "duplicate #[source] attribute"));
+ }
+ let span = (attr.pound_token.span)
+ .join(attr.bracket_token.span.join())
+ .unwrap_or(attr.path().get_ident().unwrap().span());
+ attrs.source = Some(Source {
+ original: attr,
+ span,
+ });
+ } else if attr.path().is_ident("backtrace") {
+ attr.meta.require_path_only()?;
+ if attrs.backtrace.is_some() {
+ return Err(Error::new_spanned(attr, "duplicate #[backtrace] attribute"));
+ }
+ attrs.backtrace = Some(attr);
+ } else if attr.path().is_ident("from") {
+ match attr.meta {
+ Meta::Path(_) => {}
+ Meta::List(_) | Meta::NameValue(_) => {
+ // Assume this is meant for derive_more crate or something.
+ continue;
+ }
+ }
+ if attrs.from.is_some() {
+ return Err(Error::new_spanned(attr, "duplicate #[from] attribute"));
+ }
+ let span = (attr.pound_token.span)
+ .join(attr.bracket_token.span.join())
+ .unwrap_or(attr.path().get_ident().unwrap().span());
+ attrs.from = Some(From {
+ original: attr,
+ span,
+ });
+ }
+ }
+
+ Ok(attrs)
+}
+
+fn parse_error_attribute<'a>(attrs: &mut Attrs<'a>, attr: &'a Attribute) -> Result<()> {
+ mod kw {
+ syn::custom_keyword!(transparent);
+ syn::custom_keyword!(fmt);
+ }
+
+ attr.parse_args_with(|input: ParseStream| {
+ let lookahead = input.lookahead1();
+ let fmt = if lookahead.peek(LitStr) {
+ input.parse::<LitStr>()?
+ } else if lookahead.peek(kw::transparent) {
+ let kw: kw::transparent = input.parse()?;
+ if attrs.transparent.is_some() {
+ return Err(Error::new_spanned(
+ attr,
+ "duplicate #[error(transparent)] attribute",
+ ));
+ }
+ attrs.transparent = Some(Transparent {
+ original: attr,
+ span: kw.span,
+ });
+ return Ok(());
+ } else if lookahead.peek(kw::fmt) {
+ input.parse::<kw::fmt>()?;
+ input.parse::<Token![=]>()?;
+ let path: ExprPath = input.parse()?;
+ if attrs.fmt.is_some() {
+ return Err(Error::new_spanned(
+ attr,
+ "duplicate #[error(fmt = ...)] attribute",
+ ));
+ }
+ attrs.fmt = Some(Fmt {
+ original: attr,
+ path,
+ });
+ return Ok(());
+ } else {
+ return Err(lookahead.error());
+ };
+
+ let args = if input.is_empty() || input.peek(Token![,]) && input.peek2(End) {
+ input.parse::<Option<Token![,]>>()?;
+ TokenStream::new()
+ } else {
+ parse_token_expr(input, false)?
+ };
+
+ let requires_fmt_machinery = !args.is_empty();
+
+ let display = Display {
+ original: attr,
+ fmt,
+ args,
+ requires_fmt_machinery,
+ has_bonus_display: false,
+ infinite_recursive: false,
+ implied_bounds: Set::new(),
+ bindings: Vec::new(),
+ };
+ if attrs.display.is_some() {
+ return Err(Error::new_spanned(
+ attr,
+ "only one #[error(...)] attribute is allowed",
+ ));
+ }
+ attrs.display = Some(display);
+ Ok(())
+ })
+}
+
+fn parse_token_expr(input: ParseStream, mut begin_expr: bool) -> Result<TokenStream> {
+ let mut tokens = Vec::new();
+ while !input.is_empty() {
+ if input.peek(token::Group) {
+ let group: TokenTree = input.parse()?;
+ tokens.push(group);
+ begin_expr = false;
+ continue;
+ }
+
+ if begin_expr && input.peek(Token![.]) {
+ if input.peek2(Ident) {
+ input.parse::<Token![.]>()?;
+ begin_expr = false;
+ continue;
+ } else if input.peek2(LitInt) {
+ input.parse::<Token![.]>()?;
+ let int: Index = input.parse()?;
+ tokens.push({
+ let ident = format_ident!("_{}", int.index, span = int.span);
+ TokenTree::Ident(ident)
+ });
+ begin_expr = false;
+ continue;
+ } else if input.peek2(LitFloat) {
+ let ahead = input.fork();
+ ahead.parse::<Token![.]>()?;
+ let float: LitFloat = ahead.parse()?;
+ let repr = float.to_string();
+ let mut indices = repr.split('.').map(syn::parse_str::<Index>);
+ if let (Some(Ok(first)), Some(Ok(second)), None) =
+ (indices.next(), indices.next(), indices.next())
+ {
+ input.advance_to(&ahead);
+ tokens.push({
+ let ident = format_ident!("_{}", first, span = float.span());
+ TokenTree::Ident(ident)
+ });
+ tokens.push({
+ let mut punct = Punct::new('.', Spacing::Alone);
+ punct.set_span(float.span());
+ TokenTree::Punct(punct)
+ });
+ tokens.push({
+ let mut literal = Literal::u32_unsuffixed(second.index);
+ literal.set_span(float.span());
+ TokenTree::Literal(literal)
+ });
+ begin_expr = false;
+ continue;
+ }
+ }
+ }
+
+ begin_expr = input.peek(Token![break])
+ || input.peek(Token![continue])
+ || input.peek(Token![if])
+ || input.peek(Token![in])
+ || input.peek(Token![match])
+ || input.peek(Token![mut])
+ || input.peek(Token![return])
+ || input.peek(Token![while])
+ || input.peek(Token![+])
+ || input.peek(Token![&])
+ || input.peek(Token![!])
+ || input.peek(Token![^])
+ || input.peek(Token![,])
+ || input.peek(Token![/])
+ || input.peek(Token![=])
+ || input.peek(Token![>])
+ || input.peek(Token![<])
+ || input.peek(Token![|])
+ || input.peek(Token![%])
+ || input.peek(Token![;])
+ || input.peek(Token![*])
+ || input.peek(Token![-]);
+
+ let token: TokenTree = if input.peek(token::Paren) {
+ let content;
+ let delimiter = parenthesized!(content in input);
+ let nested = parse_token_expr(&content, true)?;
+ let mut group = Group::new(Delimiter::Parenthesis, nested);
+ group.set_span(delimiter.span.join());
+ TokenTree::Group(group)
+ } else if input.peek(token::Brace) {
+ let content;
+ let delimiter = braced!(content in input);
+ let nested = parse_token_expr(&content, true)?;
+ let mut group = Group::new(Delimiter::Brace, nested);
+ group.set_span(delimiter.span.join());
+ TokenTree::Group(group)
+ } else if input.peek(token::Bracket) {
+ let content;
+ let delimiter = bracketed!(content in input);
+ let nested = parse_token_expr(&content, true)?;
+ let mut group = Group::new(Delimiter::Bracket, nested);
+ group.set_span(delimiter.span.join());
+ TokenTree::Group(group)
+ } else {
+ input.parse()?
+ };
+ tokens.push(token);
+ }
+ Ok(TokenStream::from_iter(tokens))
+}
+
+impl ToTokens for Display<'_> {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ if self.infinite_recursive {
+ let span = self.fmt.span();
+ tokens.extend(quote_spanned! {span=>
+ #[warn(unconditional_recursion)]
+ fn _fmt() { _fmt() }
+ });
+ }
+
+ let fmt = &self.fmt;
+ let args = &self.args;
+
+ // Currently `write!(f, "text")` produces less efficient code than
+ // `f.write_str("text")`. We recognize the case when the format string
+ // has no braces and no interpolated values, and generate simpler code.
+ let write = if self.requires_fmt_machinery {
+ quote! {
+ ::core::write!(__formatter, #fmt #args)
+ }
+ } else {
+ quote! {
+ __formatter.write_str(#fmt)
+ }
+ };
+
+ tokens.extend(if self.bindings.is_empty() {
+ write
+ } else {
+ let locals = self.bindings.iter().map(|(local, _value)| local);
+ let values = self.bindings.iter().map(|(_local, value)| value);
+ quote! {
+ match (#(#values,)*) {
+ (#(#locals,)*) => #write
+ }
+ }
+ });
+ }
+}
+
+impl ToTokens for Trait {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ let trait_name = match self {
+ Trait::Debug => "Debug",
+ Trait::Display => "Display",
+ Trait::Octal => "Octal",
+ Trait::LowerHex => "LowerHex",
+ Trait::UpperHex => "UpperHex",
+ Trait::Pointer => "Pointer",
+ Trait::Binary => "Binary",
+ Trait::LowerExp => "LowerExp",
+ Trait::UpperExp => "UpperExp",
+ };
+ let ident = Ident::new(trait_name, Span::call_site());
+ tokens.extend(quote!(::core::fmt::#ident));
+ }
+}
diff --git a/vendor/thiserror-impl/src/expand.rs b/vendor/thiserror-impl/src/expand.rs
new file mode 100644
index 00000000..c6939214
--- /dev/null
+++ b/vendor/thiserror-impl/src/expand.rs
@@ -0,0 +1,583 @@
+use crate::ast::{Enum, Field, Input, Struct};
+use crate::attr::Trait;
+use crate::fallback;
+use crate::generics::InferredBounds;
+use crate::unraw::MemberUnraw;
+use proc_macro2::{Ident, Span, TokenStream};
+use quote::{format_ident, quote, quote_spanned, ToTokens};
+use std::collections::BTreeSet as Set;
+use syn::{DeriveInput, GenericArgument, PathArguments, Result, Token, Type};
+
+pub fn derive(input: &DeriveInput) -> TokenStream {
+ match try_expand(input) {
+ Ok(expanded) => expanded,
+ // If there are invalid attributes in the input, expand to an Error impl
+ // anyway to minimize spurious secondary errors in other code that uses
+ // this type as an Error.
+ Err(error) => fallback::expand(input, error),
+ }
+}
+
+fn try_expand(input: &DeriveInput) -> Result<TokenStream> {
+ let input = Input::from_syn(input)?;
+ input.validate()?;
+ Ok(match input {
+ Input::Struct(input) => impl_struct(input),
+ Input::Enum(input) => impl_enum(input),
+ })
+}
+
+fn impl_struct(input: Struct) -> TokenStream {
+ let ty = call_site_ident(&input.ident);
+ let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
+ let mut error_inferred_bounds = InferredBounds::new();
+
+ let source_body = if let Some(transparent_attr) = &input.attrs.transparent {
+ let only_field = &input.fields[0];
+ if only_field.contains_generic {
+ error_inferred_bounds.insert(only_field.ty, quote!(::thiserror::__private::Error));
+ }
+ let member = &only_field.member;
+ Some(quote_spanned! {transparent_attr.span=>
+ ::thiserror::__private::Error::source(self.#member.as_dyn_error())
+ })
+ } else if let Some(source_field) = input.source_field() {
+ let source = &source_field.member;
+ if source_field.contains_generic {
+ let ty = unoptional_type(source_field.ty);
+ error_inferred_bounds.insert(ty, quote!(::thiserror::__private::Error + 'static));
+ }
+ let asref = if type_is_option(source_field.ty) {
+ Some(quote_spanned!(source.span()=> .as_ref()?))
+ } else {
+ None
+ };
+ let dyn_error = quote_spanned! {source_field.source_span()=>
+ self.#source #asref.as_dyn_error()
+ };
+ Some(quote! {
+ ::core::option::Option::Some(#dyn_error)
+ })
+ } else {
+ None
+ };
+ let source_method = source_body.map(|body| {
+ quote! {
+ fn source(&self) -> ::core::option::Option<&(dyn ::thiserror::__private::Error + 'static)> {
+ use ::thiserror::__private::AsDynError as _;
+ #body
+ }
+ }
+ });
+
+ let provide_method = input.backtrace_field().map(|backtrace_field| {
+ let request = quote!(request);
+ let backtrace = &backtrace_field.member;
+ let body = if let Some(source_field) = input.source_field() {
+ let source = &source_field.member;
+ let source_provide = if type_is_option(source_field.ty) {
+ quote_spanned! {source.span()=>
+ if let ::core::option::Option::Some(source) = &self.#source {
+ source.thiserror_provide(#request);
+ }
+ }
+ } else {
+ quote_spanned! {source.span()=>
+ self.#source.thiserror_provide(#request);
+ }
+ };
+ let self_provide = if source == backtrace {
+ None
+ } else if type_is_option(backtrace_field.ty) {
+ Some(quote! {
+ if let ::core::option::Option::Some(backtrace) = &self.#backtrace {
+ #request.provide_ref::<::thiserror::__private::Backtrace>(backtrace);
+ }
+ })
+ } else {
+ Some(quote! {
+ #request.provide_ref::<::thiserror::__private::Backtrace>(&self.#backtrace);
+ })
+ };
+ quote! {
+ use ::thiserror::__private::ThiserrorProvide as _;
+ #source_provide
+ #self_provide
+ }
+ } else if type_is_option(backtrace_field.ty) {
+ quote! {
+ if let ::core::option::Option::Some(backtrace) = &self.#backtrace {
+ #request.provide_ref::<::thiserror::__private::Backtrace>(backtrace);
+ }
+ }
+ } else {
+ quote! {
+ #request.provide_ref::<::thiserror::__private::Backtrace>(&self.#backtrace);
+ }
+ };
+ quote! {
+ fn provide<'_request>(&'_request self, #request: &mut ::core::error::Request<'_request>) {
+ #body
+ }
+ }
+ });
+
+ let mut display_implied_bounds = Set::new();
+ let display_body = if input.attrs.transparent.is_some() {
+ let only_field = &input.fields[0].member;
+ display_implied_bounds.insert((0, Trait::Display));
+ Some(quote! {
+ ::core::fmt::Display::fmt(&self.#only_field, __formatter)
+ })
+ } else if let Some(display) = &input.attrs.display {
+ display_implied_bounds.clone_from(&display.implied_bounds);
+ let use_as_display = use_as_display(display.has_bonus_display);
+ let pat = fields_pat(&input.fields);
+ Some(quote! {
+ #use_as_display
+ #[allow(unused_variables, deprecated)]
+ let Self #pat = self;
+ #display
+ })
+ } else {
+ None
+ };
+ let display_impl = display_body.map(|body| {
+ let mut display_inferred_bounds = InferredBounds::new();
+ for (field, bound) in display_implied_bounds {
+ let field = &input.fields[field];
+ if field.contains_generic {
+ display_inferred_bounds.insert(field.ty, bound);
+ }
+ }
+ let display_where_clause = display_inferred_bounds.augment_where_clause(input.generics);
+ quote! {
+ #[allow(unused_qualifications)]
+ #[automatically_derived]
+ impl #impl_generics ::core::fmt::Display for #ty #ty_generics #display_where_clause {
+ #[allow(clippy::used_underscore_binding)]
+ fn fmt(&self, __formatter: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
+ #body
+ }
+ }
+ }
+ });
+
+ let from_impl = input.from_field().map(|from_field| {
+ let span = from_field.attrs.from.unwrap().span;
+ let backtrace_field = input.distinct_backtrace_field();
+ let from = unoptional_type(from_field.ty);
+ let source_var = Ident::new("source", span);
+ let body = from_initializer(from_field, backtrace_field, &source_var);
+ let from_function = quote! {
+ fn from(#source_var: #from) -> Self {
+ #ty #body
+ }
+ };
+ let from_impl = quote_spanned! {span=>
+ #[automatically_derived]
+ impl #impl_generics ::core::convert::From<#from> for #ty #ty_generics #where_clause {
+ #from_function
+ }
+ };
+ Some(quote! {
+ #[allow(
+ deprecated,
+ unused_qualifications,
+ clippy::elidable_lifetime_names,
+ clippy::needless_lifetimes,
+ )]
+ #from_impl
+ })
+ });
+
+ if input.generics.type_params().next().is_some() {
+ let self_token = <Token![Self]>::default();
+ error_inferred_bounds.insert(self_token, Trait::Debug);
+ error_inferred_bounds.insert(self_token, Trait::Display);
+ }
+ let error_where_clause = error_inferred_bounds.augment_where_clause(input.generics);
+
+ quote! {
+ #[allow(unused_qualifications)]
+ #[automatically_derived]
+ impl #impl_generics ::thiserror::__private::Error for #ty #ty_generics #error_where_clause {
+ #source_method
+ #provide_method
+ }
+ #display_impl
+ #from_impl
+ }
+}
+
+fn impl_enum(input: Enum) -> TokenStream {
+ let ty = call_site_ident(&input.ident);
+ let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
+ let mut error_inferred_bounds = InferredBounds::new();
+
+ let source_method = if input.has_source() {
+ let arms = input.variants.iter().map(|variant| {
+ let ident = &variant.ident;
+ if let Some(transparent_attr) = &variant.attrs.transparent {
+ let only_field = &variant.fields[0];
+ if only_field.contains_generic {
+ error_inferred_bounds.insert(only_field.ty, quote!(::thiserror::__private::Error));
+ }
+ let member = &only_field.member;
+ let source = quote_spanned! {transparent_attr.span=>
+ ::thiserror::__private::Error::source(transparent.as_dyn_error())
+ };
+ quote! {
+ #ty::#ident {#member: transparent} => #source,
+ }
+ } else if let Some(source_field) = variant.source_field() {
+ let source = &source_field.member;
+ if source_field.contains_generic {
+ let ty = unoptional_type(source_field.ty);
+ error_inferred_bounds.insert(ty, quote!(::thiserror::__private::Error + 'static));
+ }
+ let asref = if type_is_option(source_field.ty) {
+ Some(quote_spanned!(source.span()=> .as_ref()?))
+ } else {
+ None
+ };
+ let varsource = quote!(source);
+ let dyn_error = quote_spanned! {source_field.source_span()=>
+ #varsource #asref.as_dyn_error()
+ };
+ quote! {
+ #ty::#ident {#source: #varsource, ..} => ::core::option::Option::Some(#dyn_error),
+ }
+ } else {
+ quote! {
+ #ty::#ident {..} => ::core::option::Option::None,
+ }
+ }
+ });
+ Some(quote! {
+ fn source(&self) -> ::core::option::Option<&(dyn ::thiserror::__private::Error + 'static)> {
+ use ::thiserror::__private::AsDynError as _;
+ #[allow(deprecated)]
+ match self {
+ #(#arms)*
+ }
+ }
+ })
+ } else {
+ None
+ };
+
+ let provide_method = if input.has_backtrace() {
+ let request = quote!(request);
+ let arms = input.variants.iter().map(|variant| {
+ let ident = &variant.ident;
+ match (variant.backtrace_field(), variant.source_field()) {
+ (Some(backtrace_field), Some(source_field))
+ if backtrace_field.attrs.backtrace.is_none() =>
+ {
+ let backtrace = &backtrace_field.member;
+ let source = &source_field.member;
+ let varsource = quote!(source);
+ let source_provide = if type_is_option(source_field.ty) {
+ quote_spanned! {source.span()=>
+ if let ::core::option::Option::Some(source) = #varsource {
+ source.thiserror_provide(#request);
+ }
+ }
+ } else {
+ quote_spanned! {source.span()=>
+ #varsource.thiserror_provide(#request);
+ }
+ };
+ let self_provide = if type_is_option(backtrace_field.ty) {
+ quote! {
+ if let ::core::option::Option::Some(backtrace) = backtrace {
+ #request.provide_ref::<::thiserror::__private::Backtrace>(backtrace);
+ }
+ }
+ } else {
+ quote! {
+ #request.provide_ref::<::thiserror::__private::Backtrace>(backtrace);
+ }
+ };
+ quote! {
+ #ty::#ident {
+ #backtrace: backtrace,
+ #source: #varsource,
+ ..
+ } => {
+ use ::thiserror::__private::ThiserrorProvide as _;
+ #source_provide
+ #self_provide
+ }
+ }
+ }
+ (Some(backtrace_field), Some(source_field))
+ if backtrace_field.member == source_field.member =>
+ {
+ let backtrace = &backtrace_field.member;
+ let varsource = quote!(source);
+ let source_provide = if type_is_option(source_field.ty) {
+ quote_spanned! {backtrace.span()=>
+ if let ::core::option::Option::Some(source) = #varsource {
+ source.thiserror_provide(#request);
+ }
+ }
+ } else {
+ quote_spanned! {backtrace.span()=>
+ #varsource.thiserror_provide(#request);
+ }
+ };
+ quote! {
+ #ty::#ident {#backtrace: #varsource, ..} => {
+ use ::thiserror::__private::ThiserrorProvide as _;
+ #source_provide
+ }
+ }
+ }
+ (Some(backtrace_field), _) => {
+ let backtrace = &backtrace_field.member;
+ let body = if type_is_option(backtrace_field.ty) {
+ quote! {
+ if let ::core::option::Option::Some(backtrace) = backtrace {
+ #request.provide_ref::<::thiserror::__private::Backtrace>(backtrace);
+ }
+ }
+ } else {
+ quote! {
+ #request.provide_ref::<::thiserror::__private::Backtrace>(backtrace);
+ }
+ };
+ quote! {
+ #ty::#ident {#backtrace: backtrace, ..} => {
+ #body
+ }
+ }
+ }
+ (None, _) => quote! {
+ #ty::#ident {..} => {}
+ },
+ }
+ });
+ Some(quote! {
+ fn provide<'_request>(&'_request self, #request: &mut ::core::error::Request<'_request>) {
+ #[allow(deprecated)]
+ match self {
+ #(#arms)*
+ }
+ }
+ })
+ } else {
+ None
+ };
+
+ let display_impl = if input.has_display() {
+ let mut display_inferred_bounds = InferredBounds::new();
+ let has_bonus_display = input.variants.iter().any(|v| {
+ v.attrs
+ .display
+ .as_ref()
+ .map_or(false, |display| display.has_bonus_display)
+ });
+ let use_as_display = use_as_display(has_bonus_display);
+ let void_deref = if input.variants.is_empty() {
+ Some(quote!(*))
+ } else {
+ None
+ };
+ let arms = input.variants.iter().map(|variant| {
+ let mut display_implied_bounds = Set::new();
+ let display = if let Some(display) = &variant.attrs.display {
+ display_implied_bounds.clone_from(&display.implied_bounds);
+ display.to_token_stream()
+ } else if let Some(fmt) = &variant.attrs.fmt {
+ let fmt_path = &fmt.path;
+ let vars = variant.fields.iter().map(|field| match &field.member {
+ MemberUnraw::Named(ident) => ident.to_local(),
+ MemberUnraw::Unnamed(index) => format_ident!("_{}", index),
+ });
+ quote!(#fmt_path(#(#vars,)* __formatter))
+ } else {
+ let only_field = match &variant.fields[0].member {
+ MemberUnraw::Named(ident) => ident.to_local(),
+ MemberUnraw::Unnamed(index) => format_ident!("_{}", index),
+ };
+ display_implied_bounds.insert((0, Trait::Display));
+ quote!(::core::fmt::Display::fmt(#only_field, __formatter))
+ };
+ for (field, bound) in display_implied_bounds {
+ let field = &variant.fields[field];
+ if field.contains_generic {
+ display_inferred_bounds.insert(field.ty, bound);
+ }
+ }
+ let ident = &variant.ident;
+ let pat = fields_pat(&variant.fields);
+ quote! {
+ #ty::#ident #pat => #display
+ }
+ });
+ let arms = arms.collect::<Vec<_>>();
+ let display_where_clause = display_inferred_bounds.augment_where_clause(input.generics);
+ Some(quote! {
+ #[allow(unused_qualifications)]
+ #[automatically_derived]
+ impl #impl_generics ::core::fmt::Display for #ty #ty_generics #display_where_clause {
+ fn fmt(&self, __formatter: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
+ #use_as_display
+ #[allow(unused_variables, deprecated, clippy::used_underscore_binding)]
+ match #void_deref self {
+ #(#arms,)*
+ }
+ }
+ }
+ })
+ } else {
+ None
+ };
+
+ let from_impls = input.variants.iter().filter_map(|variant| {
+ let from_field = variant.from_field()?;
+ let span = from_field.attrs.from.unwrap().span;
+ let backtrace_field = variant.distinct_backtrace_field();
+ let variant = &variant.ident;
+ let from = unoptional_type(from_field.ty);
+ let source_var = Ident::new("source", span);
+ let body = from_initializer(from_field, backtrace_field, &source_var);
+ let from_function = quote! {
+ fn from(#source_var: #from) -> Self {
+ #ty::#variant #body
+ }
+ };
+ let from_impl = quote_spanned! {span=>
+ #[automatically_derived]
+ impl #impl_generics ::core::convert::From<#from> for #ty #ty_generics #where_clause {
+ #from_function
+ }
+ };
+ Some(quote! {
+ #[allow(
+ deprecated,
+ unused_qualifications,
+ clippy::elidable_lifetime_names,
+ clippy::needless_lifetimes,
+ )]
+ #from_impl
+ })
+ });
+
+ if input.generics.type_params().next().is_some() {
+ let self_token = <Token![Self]>::default();
+ error_inferred_bounds.insert(self_token, Trait::Debug);
+ error_inferred_bounds.insert(self_token, Trait::Display);
+ }
+ let error_where_clause = error_inferred_bounds.augment_where_clause(input.generics);
+
+ quote! {
+ #[allow(unused_qualifications)]
+ #[automatically_derived]
+ impl #impl_generics ::thiserror::__private::Error for #ty #ty_generics #error_where_clause {
+ #source_method
+ #provide_method
+ }
+ #display_impl
+ #(#from_impls)*
+ }
+}
+
+// Create an ident with which we can expand `impl Trait for #ident {}` on a
+// deprecated type without triggering deprecation warning on the generated impl.
+pub(crate) fn call_site_ident(ident: &Ident) -> Ident {
+ let mut ident = ident.clone();
+ ident.set_span(ident.span().resolved_at(Span::call_site()));
+ ident
+}
+
+fn fields_pat(fields: &[Field]) -> TokenStream {
+ let mut members = fields.iter().map(|field| &field.member).peekable();
+ match members.peek() {
+ Some(MemberUnraw::Named(_)) => quote!({ #(#members),* }),
+ Some(MemberUnraw::Unnamed(_)) => {
+ let vars = members.map(|member| match member {
+ MemberUnraw::Unnamed(index) => format_ident!("_{}", index),
+ MemberUnraw::Named(_) => unreachable!(),
+ });
+ quote!((#(#vars),*))
+ }
+ None => quote!({}),
+ }
+}
+
+fn use_as_display(needs_as_display: bool) -> Option<TokenStream> {
+ if needs_as_display {
+ Some(quote! {
+ use ::thiserror::__private::AsDisplay as _;
+ })
+ } else {
+ None
+ }
+}
+
+fn from_initializer(
+ from_field: &Field,
+ backtrace_field: Option<&Field>,
+ source_var: &Ident,
+) -> TokenStream {
+ let from_member = &from_field.member;
+ let some_source = if type_is_option(from_field.ty) {
+ quote!(::core::option::Option::Some(#source_var))
+ } else {
+ quote!(#source_var)
+ };
+ let backtrace = backtrace_field.map(|backtrace_field| {
+ let backtrace_member = &backtrace_field.member;
+ if type_is_option(backtrace_field.ty) {
+ quote! {
+ #backtrace_member: ::core::option::Option::Some(::thiserror::__private::Backtrace::capture()),
+ }
+ } else {
+ quote! {
+ #backtrace_member: ::core::convert::From::from(::thiserror::__private::Backtrace::capture()),
+ }
+ }
+ });
+ quote!({
+ #from_member: #some_source,
+ #backtrace
+ })
+}
+
+fn type_is_option(ty: &Type) -> bool {
+ type_parameter_of_option(ty).is_some()
+}
+
+fn unoptional_type(ty: &Type) -> TokenStream {
+ let unoptional = type_parameter_of_option(ty).unwrap_or(ty);
+ quote!(#unoptional)
+}
+
+fn type_parameter_of_option(ty: &Type) -> Option<&Type> {
+ let path = match ty {
+ Type::Path(ty) => &ty.path,
+ _ => return None,
+ };
+
+ let last = path.segments.last().unwrap();
+ if last.ident != "Option" {
+ return None;
+ }
+
+ let bracketed = match &last.arguments {
+ PathArguments::AngleBracketed(bracketed) => bracketed,
+ _ => return None,
+ };
+
+ if bracketed.args.len() != 1 {
+ return None;
+ }
+
+ match &bracketed.args[0] {
+ GenericArgument::Type(arg) => Some(arg),
+ _ => None,
+ }
+}
diff --git a/vendor/thiserror-impl/src/fallback.rs b/vendor/thiserror-impl/src/fallback.rs
new file mode 100644
index 00000000..e9c429ba
--- /dev/null
+++ b/vendor/thiserror-impl/src/fallback.rs
@@ -0,0 +1,32 @@
+use crate::expand::call_site_ident;
+use proc_macro2::TokenStream;
+use quote::quote;
+use syn::DeriveInput;
+
+pub(crate) fn expand(input: &DeriveInput, error: syn::Error) -> TokenStream {
+ let ty = call_site_ident(&input.ident);
+ let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
+
+ let error = error.to_compile_error();
+
+ quote! {
+ #error
+
+ #[allow(unused_qualifications)]
+ #[automatically_derived]
+ impl #impl_generics ::thiserror::__private::Error for #ty #ty_generics #where_clause
+ where
+ // Work around trivial bounds being unstable.
+ // https://github.com/rust-lang/rust/issues/48214
+ for<'workaround> #ty #ty_generics: ::core::fmt::Debug,
+ {}
+
+ #[allow(unused_qualifications)]
+ #[automatically_derived]
+ impl #impl_generics ::core::fmt::Display for #ty #ty_generics #where_clause {
+ fn fmt(&self, __formatter: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
+ ::core::unreachable!()
+ }
+ }
+ }
+}
diff --git a/vendor/thiserror-impl/src/fmt.rs b/vendor/thiserror-impl/src/fmt.rs
new file mode 100644
index 00000000..1da28c19
--- /dev/null
+++ b/vendor/thiserror-impl/src/fmt.rs
@@ -0,0 +1,322 @@
+use crate::ast::{ContainerKind, Field};
+use crate::attr::{Display, Trait};
+use crate::scan_expr::scan_expr;
+use crate::unraw::{IdentUnraw, MemberUnraw};
+use proc_macro2::{Delimiter, TokenStream, TokenTree};
+use quote::{format_ident, quote, quote_spanned, ToTokens as _};
+use std::collections::{BTreeSet, HashMap};
+use std::iter;
+use syn::ext::IdentExt;
+use syn::parse::discouraged::Speculative;
+use syn::parse::{Error, ParseStream, Parser, Result};
+use syn::{Expr, Ident, Index, LitStr, Token};
+
+impl Display<'_> {
+ pub fn expand_shorthand(&mut self, fields: &[Field], container: ContainerKind) -> Result<()> {
+ let raw_args = self.args.clone();
+ let FmtArguments {
+ named: user_named_args,
+ first_unnamed,
+ } = explicit_named_args.parse2(raw_args).unwrap();
+
+ let mut member_index = HashMap::new();
+ let mut extra_positional_arguments_allowed = true;
+ for (i, field) in fields.iter().enumerate() {
+ member_index.insert(&field.member, i);
+ extra_positional_arguments_allowed &= matches!(&field.member, MemberUnraw::Named(_));
+ }
+
+ let span = self.fmt.span();
+ let fmt = self.fmt.value();
+ let mut read = fmt.as_str();
+ let mut out = String::new();
+ let mut has_bonus_display = false;
+ let mut infinite_recursive = false;
+ let mut implied_bounds = BTreeSet::new();
+ let mut bindings = Vec::new();
+ let mut macro_named_args = BTreeSet::new();
+
+ self.requires_fmt_machinery = self.requires_fmt_machinery || fmt.contains('}');
+
+ while let Some(brace) = read.find('{') {
+ self.requires_fmt_machinery = true;
+ out += &read[..brace + 1];
+ read = &read[brace + 1..];
+ if read.starts_with('{') {
+ out.push('{');
+ read = &read[1..];
+ continue;
+ }
+ let next = match read.chars().next() {
+ Some(next) => next,
+ None => return Ok(()),
+ };
+ let member = match next {
+ '0'..='9' => {
+ let int = take_int(&mut read);
+ if !extra_positional_arguments_allowed {
+ if let Some(first_unnamed) = &first_unnamed {
+ let msg = format!("ambiguous reference to positional arguments by number in a {container}; change this to a named argument");
+ return Err(Error::new_spanned(first_unnamed, msg));
+ }
+ }
+ match int.parse::<u32>() {
+ Ok(index) => MemberUnraw::Unnamed(Index { index, span }),
+ Err(_) => return Ok(()),
+ }
+ }
+ 'a'..='z' | 'A'..='Z' | '_' => {
+ if read.starts_with("r#") {
+ continue;
+ }
+ let repr = take_ident(&mut read);
+ if repr == "_" {
+ // Invalid. Let rustc produce the diagnostic.
+ out += repr;
+ continue;
+ }
+ let ident = IdentUnraw::new(Ident::new(repr, span));
+ if user_named_args.contains(&ident) {
+ // Refers to a named argument written by the user, not to field.
+ out += repr;
+ continue;
+ }
+ MemberUnraw::Named(ident)
+ }
+ _ => continue,
+ };
+ let end_spec = match read.find('}') {
+ Some(end_spec) => end_spec,
+ None => return Ok(()),
+ };
+ let mut bonus_display = false;
+ let bound = match read[..end_spec].chars().next_back() {
+ Some('?') => Trait::Debug,
+ Some('o') => Trait::Octal,
+ Some('x') => Trait::LowerHex,
+ Some('X') => Trait::UpperHex,
+ Some('p') => Trait::Pointer,
+ Some('b') => Trait::Binary,
+ Some('e') => Trait::LowerExp,
+ Some('E') => Trait::UpperExp,
+ Some(_) => Trait::Display,
+ None => {
+ bonus_display = true;
+ has_bonus_display = true;
+ Trait::Display
+ }
+ };
+ infinite_recursive |= member == *"self" && bound == Trait::Display;
+ let field = match member_index.get(&member) {
+ Some(&field) => field,
+ None => {
+ out += &member.to_string();
+ continue;
+ }
+ };
+ implied_bounds.insert((field, bound));
+ let formatvar_prefix = if bonus_display {
+ "__display"
+ } else if bound == Trait::Pointer {
+ "__pointer"
+ } else {
+ "__field"
+ };
+ let mut formatvar = IdentUnraw::new(match &member {
+ MemberUnraw::Unnamed(index) => format_ident!("{}{}", formatvar_prefix, index),
+ MemberUnraw::Named(ident) => {
+ format_ident!("{}_{}", formatvar_prefix, ident.to_string())
+ }
+ });
+ while user_named_args.contains(&formatvar) {
+ formatvar = IdentUnraw::new(format_ident!("_{}", formatvar.to_string()));
+ }
+ formatvar.set_span(span);
+ out += &formatvar.to_string();
+ if !macro_named_args.insert(formatvar.clone()) {
+ // Already added to bindings by a previous use.
+ continue;
+ }
+ let mut binding_value = match &member {
+ MemberUnraw::Unnamed(index) => format_ident!("_{}", index),
+ MemberUnraw::Named(ident) => ident.to_local(),
+ };
+ binding_value.set_span(span.resolved_at(fields[field].member.span()));
+ let wrapped_binding_value = if bonus_display {
+ quote_spanned!(span=> #binding_value.as_display())
+ } else if bound == Trait::Pointer {
+ quote!(::thiserror::__private::Var(#binding_value))
+ } else {
+ binding_value.into_token_stream()
+ };
+ bindings.push((formatvar.to_local(), wrapped_binding_value));
+ }
+
+ out += read;
+ self.fmt = LitStr::new(&out, self.fmt.span());
+ self.has_bonus_display = has_bonus_display;
+ self.infinite_recursive = infinite_recursive;
+ self.implied_bounds = implied_bounds;
+ self.bindings = bindings;
+ Ok(())
+ }
+}
+
+struct FmtArguments {
+ named: BTreeSet<IdentUnraw>,
+ first_unnamed: Option<TokenStream>,
+}
+
+#[allow(clippy::unnecessary_wraps)]
+fn explicit_named_args(input: ParseStream) -> Result<FmtArguments> {
+ let ahead = input.fork();
+ if let Ok(set) = try_explicit_named_args(&ahead) {
+ input.advance_to(&ahead);
+ return Ok(set);
+ }
+
+ let ahead = input.fork();
+ if let Ok(set) = fallback_explicit_named_args(&ahead) {
+ input.advance_to(&ahead);
+ return Ok(set);
+ }
+
+ input.parse::<TokenStream>().unwrap();
+ Ok(FmtArguments {
+ named: BTreeSet::new(),
+ first_unnamed: None,
+ })
+}
+
+fn try_explicit_named_args(input: ParseStream) -> Result<FmtArguments> {
+ let mut syn_full = None;
+ let mut args = FmtArguments {
+ named: BTreeSet::new(),
+ first_unnamed: None,
+ };
+
+ while !input.is_empty() {
+ input.parse::<Token![,]>()?;
+ if input.is_empty() {
+ break;
+ }
+
+ let mut begin_unnamed = None;
+ if input.peek(Ident::peek_any) && input.peek2(Token![=]) && !input.peek2(Token![==]) {
+ let ident: IdentUnraw = input.parse()?;
+ input.parse::<Token![=]>()?;
+ args.named.insert(ident);
+ } else {
+ begin_unnamed = Some(input.fork());
+ }
+
+ let ahead = input.fork();
+ if *syn_full.get_or_insert_with(is_syn_full) && ahead.parse::<Expr>().is_ok() {
+ input.advance_to(&ahead);
+ } else {
+ scan_expr(input)?;
+ }
+
+ if let Some(begin_unnamed) = begin_unnamed {
+ if args.first_unnamed.is_none() {
+ args.first_unnamed = Some(between(&begin_unnamed, input));
+ }
+ }
+ }
+
+ Ok(args)
+}
+
+fn fallback_explicit_named_args(input: ParseStream) -> Result<FmtArguments> {
+ let mut args = FmtArguments {
+ named: BTreeSet::new(),
+ first_unnamed: None,
+ };
+
+ while !input.is_empty() {
+ if input.peek(Token![,])
+ && input.peek2(Ident::peek_any)
+ && input.peek3(Token![=])
+ && !input.peek3(Token![==])
+ {
+ input.parse::<Token![,]>()?;
+ let ident: IdentUnraw = input.parse()?;
+ input.parse::<Token![=]>()?;
+ args.named.insert(ident);
+ } else {
+ input.parse::<TokenTree>()?;
+ }
+ }
+
+ Ok(args)
+}
+
+fn is_syn_full() -> bool {
+ // Expr::Block contains syn::Block which contains Vec<syn::Stmt>. In the
+ // current version of Syn, syn::Stmt is exhaustive and could only plausibly
+ // represent `trait Trait {}` in Stmt::Item which contains syn::Item. Most
+ // of the point of syn's non-"full" mode is to avoid compiling Item and the
+ // entire expansive syntax tree it comprises. So the following expression
+ // being parsed to Expr::Block is a reliable indication that "full" is
+ // enabled.
+ let test = quote!({
+ trait Trait {}
+ });
+ match syn::parse2(test) {
+ Ok(Expr::Verbatim(_)) | Err(_) => false,
+ Ok(Expr::Block(_)) => true,
+ Ok(_) => unreachable!(),
+ }
+}
+
+fn take_int<'a>(read: &mut &'a str) -> &'a str {
+ let mut int_len = 0;
+ for ch in read.chars() {
+ match ch {
+ '0'..='9' => int_len += 1,
+ _ => break,
+ }
+ }
+ let (int, rest) = read.split_at(int_len);
+ *read = rest;
+ int
+}
+
+fn take_ident<'a>(read: &mut &'a str) -> &'a str {
+ let mut ident_len = 0;
+ for ch in read.chars() {
+ match ch {
+ 'a'..='z' | 'A'..='Z' | '0'..='9' | '_' => ident_len += 1,
+ _ => break,
+ }
+ }
+ let (ident, rest) = read.split_at(ident_len);
+ *read = rest;
+ ident
+}
+
+fn between<'a>(begin: ParseStream<'a>, end: ParseStream<'a>) -> TokenStream {
+ let end = end.cursor();
+ let mut cursor = begin.cursor();
+ let mut tokens = TokenStream::new();
+
+ while cursor < end {
+ let (tt, next) = cursor.token_tree().unwrap();
+
+ if end < next {
+ if let Some((inside, _span, _after)) = cursor.group(Delimiter::None) {
+ cursor = inside;
+ continue;
+ }
+ if tokens.is_empty() {
+ tokens.extend(iter::once(tt));
+ }
+ break;
+ }
+
+ tokens.extend(iter::once(tt));
+ cursor = next;
+ }
+
+ tokens
+}
diff --git a/vendor/thiserror-impl/src/generics.rs b/vendor/thiserror-impl/src/generics.rs
new file mode 100644
index 00000000..26fe0a9a
--- /dev/null
+++ b/vendor/thiserror-impl/src/generics.rs
@@ -0,0 +1,83 @@
+use proc_macro2::TokenStream;
+use quote::ToTokens;
+use std::collections::btree_map::Entry;
+use std::collections::{BTreeMap as Map, BTreeSet as Set};
+use syn::punctuated::Punctuated;
+use syn::{parse_quote, GenericArgument, Generics, Ident, PathArguments, Token, Type, WhereClause};
+
+pub struct ParamsInScope<'a> {
+ names: Set<&'a Ident>,
+}
+
+impl<'a> ParamsInScope<'a> {
+ pub fn new(generics: &'a Generics) -> Self {
+ ParamsInScope {
+ names: generics.type_params().map(|param| &param.ident).collect(),
+ }
+ }
+
+ pub fn intersects(&self, ty: &Type) -> bool {
+ let mut found = false;
+ crawl(self, ty, &mut found);
+ found
+ }
+}
+
+fn crawl(in_scope: &ParamsInScope, ty: &Type, found: &mut bool) {
+ if let Type::Path(ty) = ty {
+ if let Some(qself) = &ty.qself {
+ crawl(in_scope, &qself.ty, found);
+ } else {
+ let front = ty.path.segments.first().unwrap();
+ if front.arguments.is_none() && in_scope.names.contains(&front.ident) {
+ *found = true;
+ }
+ }
+ for segment in &ty.path.segments {
+ if let PathArguments::AngleBracketed(arguments) = &segment.arguments {
+ for arg in &arguments.args {
+ if let GenericArgument::Type(ty) = arg {
+ crawl(in_scope, ty, found);
+ }
+ }
+ }
+ }
+ }
+}
+
+pub struct InferredBounds {
+ bounds: Map<String, (Set<String>, Punctuated<TokenStream, Token![+]>)>,
+ order: Vec<TokenStream>,
+}
+
+impl InferredBounds {
+ pub fn new() -> Self {
+ InferredBounds {
+ bounds: Map::new(),
+ order: Vec::new(),
+ }
+ }
+
+ pub fn insert(&mut self, ty: impl ToTokens, bound: impl ToTokens) {
+ let ty = ty.to_token_stream();
+ let bound = bound.to_token_stream();
+ let entry = self.bounds.entry(ty.to_string());
+ if let Entry::Vacant(_) = entry {
+ self.order.push(ty);
+ }
+ let (set, tokens) = entry.or_default();
+ if set.insert(bound.to_string()) {
+ tokens.push(bound);
+ }
+ }
+
+ pub fn augment_where_clause(&self, generics: &Generics) -> WhereClause {
+ let mut generics = generics.clone();
+ let where_clause = generics.make_where_clause();
+ for ty in &self.order {
+ let (_set, bounds) = &self.bounds[&ty.to_string()];
+ where_clause.predicates.push(parse_quote!(#ty: #bounds));
+ }
+ generics.where_clause.unwrap()
+ }
+}
diff --git a/vendor/thiserror-impl/src/lib.rs b/vendor/thiserror-impl/src/lib.rs
new file mode 100644
index 00000000..7f3767ef
--- /dev/null
+++ b/vendor/thiserror-impl/src/lib.rs
@@ -0,0 +1,39 @@
+#![allow(
+ clippy::blocks_in_conditions,
+ clippy::cast_lossless,
+ clippy::cast_possible_truncation,
+ clippy::enum_glob_use,
+ clippy::manual_find,
+ clippy::manual_let_else,
+ clippy::manual_map,
+ clippy::map_unwrap_or,
+ clippy::module_name_repetitions,
+ clippy::needless_pass_by_value,
+ clippy::range_plus_one,
+ clippy::single_match_else,
+ clippy::struct_field_names,
+ clippy::too_many_lines,
+ clippy::wrong_self_convention
+)]
+
+extern crate proc_macro;
+
+mod ast;
+mod attr;
+mod expand;
+mod fallback;
+mod fmt;
+mod generics;
+mod prop;
+mod scan_expr;
+mod unraw;
+mod valid;
+
+use proc_macro::TokenStream;
+use syn::{parse_macro_input, DeriveInput};
+
+#[proc_macro_derive(Error, attributes(backtrace, error, from, source))]
+pub fn derive_error(input: TokenStream) -> TokenStream {
+ let input = parse_macro_input!(input as DeriveInput);
+ expand::derive(&input).into()
+}
diff --git a/vendor/thiserror-impl/src/prop.rs b/vendor/thiserror-impl/src/prop.rs
new file mode 100644
index 00000000..0a101fc0
--- /dev/null
+++ b/vendor/thiserror-impl/src/prop.rs
@@ -0,0 +1,148 @@
+use crate::ast::{Enum, Field, Struct, Variant};
+use crate::unraw::MemberUnraw;
+use proc_macro2::Span;
+use syn::Type;
+
+impl Struct<'_> {
+ pub(crate) fn from_field(&self) -> Option<&Field> {
+ from_field(&self.fields)
+ }
+
+ pub(crate) fn source_field(&self) -> Option<&Field> {
+ source_field(&self.fields)
+ }
+
+ pub(crate) fn backtrace_field(&self) -> Option<&Field> {
+ backtrace_field(&self.fields)
+ }
+
+ pub(crate) fn distinct_backtrace_field(&self) -> Option<&Field> {
+ let backtrace_field = self.backtrace_field()?;
+ distinct_backtrace_field(backtrace_field, self.from_field())
+ }
+}
+
+impl Enum<'_> {
+ pub(crate) fn has_source(&self) -> bool {
+ self.variants
+ .iter()
+ .any(|variant| variant.source_field().is_some() || variant.attrs.transparent.is_some())
+ }
+
+ pub(crate) fn has_backtrace(&self) -> bool {
+ self.variants
+ .iter()
+ .any(|variant| variant.backtrace_field().is_some())
+ }
+
+ pub(crate) fn has_display(&self) -> bool {
+ self.attrs.display.is_some()
+ || self.attrs.transparent.is_some()
+ || self.attrs.fmt.is_some()
+ || self
+ .variants
+ .iter()
+ .any(|variant| variant.attrs.display.is_some() || variant.attrs.fmt.is_some())
+ || self
+ .variants
+ .iter()
+ .all(|variant| variant.attrs.transparent.is_some())
+ }
+}
+
+impl Variant<'_> {
+ pub(crate) fn from_field(&self) -> Option<&Field> {
+ from_field(&self.fields)
+ }
+
+ pub(crate) fn source_field(&self) -> Option<&Field> {
+ source_field(&self.fields)
+ }
+
+ pub(crate) fn backtrace_field(&self) -> Option<&Field> {
+ backtrace_field(&self.fields)
+ }
+
+ pub(crate) fn distinct_backtrace_field(&self) -> Option<&Field> {
+ let backtrace_field = self.backtrace_field()?;
+ distinct_backtrace_field(backtrace_field, self.from_field())
+ }
+}
+
+impl Field<'_> {
+ pub(crate) fn is_backtrace(&self) -> bool {
+ type_is_backtrace(self.ty)
+ }
+
+ pub(crate) fn source_span(&self) -> Span {
+ if let Some(source_attr) = &self.attrs.source {
+ source_attr.span
+ } else if let Some(from_attr) = &self.attrs.from {
+ from_attr.span
+ } else {
+ self.member.span()
+ }
+ }
+}
+
+fn from_field<'a, 'b>(fields: &'a [Field<'b>]) -> Option<&'a Field<'b>> {
+ for field in fields {
+ if field.attrs.from.is_some() {
+ return Some(field);
+ }
+ }
+ None
+}
+
+fn source_field<'a, 'b>(fields: &'a [Field<'b>]) -> Option<&'a Field<'b>> {
+ for field in fields {
+ if field.attrs.from.is_some() || field.attrs.source.is_some() {
+ return Some(field);
+ }
+ }
+ for field in fields {
+ match &field.member {
+ MemberUnraw::Named(ident) if ident == "source" => return Some(field),
+ _ => {}
+ }
+ }
+ None
+}
+
+fn backtrace_field<'a, 'b>(fields: &'a [Field<'b>]) -> Option<&'a Field<'b>> {
+ for field in fields {
+ if field.attrs.backtrace.is_some() {
+ return Some(field);
+ }
+ }
+ for field in fields {
+ if field.is_backtrace() {
+ return Some(field);
+ }
+ }
+ None
+}
+
+// The #[backtrace] field, if it is not the same as the #[from] field.
+fn distinct_backtrace_field<'a, 'b>(
+ backtrace_field: &'a Field<'b>,
+ from_field: Option<&Field>,
+) -> Option<&'a Field<'b>> {
+ if from_field.map_or(false, |from_field| {
+ from_field.member == backtrace_field.member
+ }) {
+ None
+ } else {
+ Some(backtrace_field)
+ }
+}
+
+fn type_is_backtrace(ty: &Type) -> bool {
+ let path = match ty {
+ Type::Path(ty) => &ty.path,
+ _ => return false,
+ };
+
+ let last = path.segments.last().unwrap();
+ last.ident == "Backtrace" && last.arguments.is_empty()
+}
diff --git a/vendor/thiserror-impl/src/scan_expr.rs b/vendor/thiserror-impl/src/scan_expr.rs
new file mode 100644
index 00000000..155b5b63
--- /dev/null
+++ b/vendor/thiserror-impl/src/scan_expr.rs
@@ -0,0 +1,264 @@
+use self::{Action::*, Input::*};
+use proc_macro2::{Delimiter, Ident, Spacing, TokenTree};
+use syn::parse::{ParseStream, Result};
+use syn::{AngleBracketedGenericArguments, BinOp, Expr, ExprPath, Lifetime, Lit, Token, Type};
+
+enum Input {
+ Keyword(&'static str),
+ Punct(&'static str),
+ ConsumeAny,
+ ConsumeBinOp,
+ ConsumeBrace,
+ ConsumeDelimiter,
+ ConsumeIdent,
+ ConsumeLifetime,
+ ConsumeLiteral,
+ ConsumeNestedBrace,
+ ExpectPath,
+ ExpectTurbofish,
+ ExpectType,
+ CanBeginExpr,
+ Otherwise,
+ Empty,
+}
+
+enum Action {
+ SetState(&'static [(Input, Action)]),
+ IncDepth,
+ DecDepth,
+ Finish,
+}
+
+static INIT: [(Input, Action); 28] = [
+ (ConsumeDelimiter, SetState(&POSTFIX)),
+ (Keyword("async"), SetState(&ASYNC)),
+ (Keyword("break"), SetState(&BREAK_LABEL)),
+ (Keyword("const"), SetState(&CONST)),
+ (Keyword("continue"), SetState(&CONTINUE)),
+ (Keyword("for"), SetState(&FOR)),
+ (Keyword("if"), IncDepth),
+ (Keyword("let"), SetState(&PATTERN)),
+ (Keyword("loop"), SetState(&BLOCK)),
+ (Keyword("match"), IncDepth),
+ (Keyword("move"), SetState(&CLOSURE)),
+ (Keyword("return"), SetState(&RETURN)),
+ (Keyword("static"), SetState(&CLOSURE)),
+ (Keyword("unsafe"), SetState(&BLOCK)),
+ (Keyword("while"), IncDepth),
+ (Keyword("yield"), SetState(&RETURN)),
+ (Keyword("_"), SetState(&POSTFIX)),
+ (Punct("!"), SetState(&INIT)),
+ (Punct("#"), SetState(&[(ConsumeDelimiter, SetState(&INIT))])),
+ (Punct("&"), SetState(&REFERENCE)),
+ (Punct("*"), SetState(&INIT)),
+ (Punct("-"), SetState(&INIT)),
+ (Punct("..="), SetState(&INIT)),
+ (Punct(".."), SetState(&RANGE)),
+ (Punct("|"), SetState(&CLOSURE_ARGS)),
+ (ConsumeLifetime, SetState(&[(Punct(":"), SetState(&INIT))])),
+ (ConsumeLiteral, SetState(&POSTFIX)),
+ (ExpectPath, SetState(&PATH)),
+];
+
+static POSTFIX: [(Input, Action); 10] = [
+ (Keyword("as"), SetState(&[(ExpectType, SetState(&POSTFIX))])),
+ (Punct("..="), SetState(&INIT)),
+ (Punct(".."), SetState(&RANGE)),
+ (Punct("."), SetState(&DOT)),
+ (Punct("?"), SetState(&POSTFIX)),
+ (ConsumeBinOp, SetState(&INIT)),
+ (Punct("="), SetState(&INIT)),
+ (ConsumeNestedBrace, SetState(&IF_THEN)),
+ (ConsumeDelimiter, SetState(&POSTFIX)),
+ (Empty, Finish),
+];
+
+static ASYNC: [(Input, Action); 3] = [
+ (Keyword("move"), SetState(&ASYNC)),
+ (Punct("|"), SetState(&CLOSURE_ARGS)),
+ (ConsumeBrace, SetState(&POSTFIX)),
+];
+
+static BLOCK: [(Input, Action); 1] = [(ConsumeBrace, SetState(&POSTFIX))];
+
+static BREAK_LABEL: [(Input, Action); 2] = [
+ (ConsumeLifetime, SetState(&BREAK_VALUE)),
+ (Otherwise, SetState(&BREAK_VALUE)),
+];
+
+static BREAK_VALUE: [(Input, Action); 3] = [
+ (ConsumeNestedBrace, SetState(&IF_THEN)),
+ (CanBeginExpr, SetState(&INIT)),
+ (Otherwise, SetState(&POSTFIX)),
+];
+
+static CLOSURE: [(Input, Action); 6] = [
+ (Keyword("async"), SetState(&CLOSURE)),
+ (Keyword("move"), SetState(&CLOSURE)),
+ (Punct(","), SetState(&CLOSURE)),
+ (Punct(">"), SetState(&CLOSURE)),
+ (Punct("|"), SetState(&CLOSURE_ARGS)),
+ (ConsumeLifetime, SetState(&CLOSURE)),
+];
+
+static CLOSURE_ARGS: [(Input, Action); 2] = [
+ (Punct("|"), SetState(&CLOSURE_RET)),
+ (ConsumeAny, SetState(&CLOSURE_ARGS)),
+];
+
+static CLOSURE_RET: [(Input, Action); 2] = [
+ (Punct("->"), SetState(&[(ExpectType, SetState(&BLOCK))])),
+ (Otherwise, SetState(&INIT)),
+];
+
+static CONST: [(Input, Action); 2] = [
+ (Punct("|"), SetState(&CLOSURE_ARGS)),
+ (ConsumeBrace, SetState(&POSTFIX)),
+];
+
+static CONTINUE: [(Input, Action); 2] = [
+ (ConsumeLifetime, SetState(&POSTFIX)),
+ (Otherwise, SetState(&POSTFIX)),
+];
+
+static DOT: [(Input, Action); 3] = [
+ (Keyword("await"), SetState(&POSTFIX)),
+ (ConsumeIdent, SetState(&METHOD)),
+ (ConsumeLiteral, SetState(&POSTFIX)),
+];
+
+static FOR: [(Input, Action); 2] = [
+ (Punct("<"), SetState(&CLOSURE)),
+ (Otherwise, SetState(&PATTERN)),
+];
+
+static IF_ELSE: [(Input, Action); 2] = [(Keyword("if"), SetState(&INIT)), (ConsumeBrace, DecDepth)];
+static IF_THEN: [(Input, Action); 2] =
+ [(Keyword("else"), SetState(&IF_ELSE)), (Otherwise, DecDepth)];
+
+static METHOD: [(Input, Action); 1] = [(ExpectTurbofish, SetState(&POSTFIX))];
+
+static PATH: [(Input, Action); 4] = [
+ (Punct("!="), SetState(&INIT)),
+ (Punct("!"), SetState(&INIT)),
+ (ConsumeNestedBrace, SetState(&IF_THEN)),
+ (Otherwise, SetState(&POSTFIX)),
+];
+
+static PATTERN: [(Input, Action); 15] = [
+ (ConsumeDelimiter, SetState(&PATTERN)),
+ (Keyword("box"), SetState(&PATTERN)),
+ (Keyword("in"), IncDepth),
+ (Keyword("mut"), SetState(&PATTERN)),
+ (Keyword("ref"), SetState(&PATTERN)),
+ (Keyword("_"), SetState(&PATTERN)),
+ (Punct("!"), SetState(&PATTERN)),
+ (Punct("&"), SetState(&PATTERN)),
+ (Punct("..="), SetState(&PATTERN)),
+ (Punct(".."), SetState(&PATTERN)),
+ (Punct("="), SetState(&INIT)),
+ (Punct("@"), SetState(&PATTERN)),
+ (Punct("|"), SetState(&PATTERN)),
+ (ConsumeLiteral, SetState(&PATTERN)),
+ (ExpectPath, SetState(&PATTERN)),
+];
+
+static RANGE: [(Input, Action); 6] = [
+ (Punct("..="), SetState(&INIT)),
+ (Punct(".."), SetState(&RANGE)),
+ (Punct("."), SetState(&DOT)),
+ (ConsumeNestedBrace, SetState(&IF_THEN)),
+ (Empty, Finish),
+ (Otherwise, SetState(&INIT)),
+];
+
+static RAW: [(Input, Action); 3] = [
+ (Keyword("const"), SetState(&INIT)),
+ (Keyword("mut"), SetState(&INIT)),
+ (Otherwise, SetState(&POSTFIX)),
+];
+
+static REFERENCE: [(Input, Action); 3] = [
+ (Keyword("mut"), SetState(&INIT)),
+ (Keyword("raw"), SetState(&RAW)),
+ (Otherwise, SetState(&INIT)),
+];
+
+static RETURN: [(Input, Action); 2] = [
+ (CanBeginExpr, SetState(&INIT)),
+ (Otherwise, SetState(&POSTFIX)),
+];
+
+pub(crate) fn scan_expr(input: ParseStream) -> Result<()> {
+ let mut state = INIT.as_slice();
+ let mut depth = 0usize;
+ 'table: loop {
+ for rule in state {
+ if match rule.0 {
+ Input::Keyword(expected) => input.step(|cursor| match cursor.ident() {
+ Some((ident, rest)) if ident == expected => Ok((true, rest)),
+ _ => Ok((false, *cursor)),
+ })?,
+ Input::Punct(expected) => input.step(|cursor| {
+ let begin = *cursor;
+ let mut cursor = begin;
+ for (i, ch) in expected.chars().enumerate() {
+ match cursor.punct() {
+ Some((punct, _)) if punct.as_char() != ch => break,
+ Some((_, rest)) if i == expected.len() - 1 => {
+ return Ok((true, rest));
+ }
+ Some((punct, rest)) if punct.spacing() == Spacing::Joint => {
+ cursor = rest;
+ }
+ _ => break,
+ }
+ }
+ Ok((false, begin))
+ })?,
+ Input::ConsumeAny => input.parse::<Option<TokenTree>>()?.is_some(),
+ Input::ConsumeBinOp => input.parse::<BinOp>().is_ok(),
+ Input::ConsumeBrace | Input::ConsumeNestedBrace => {
+ (matches!(rule.0, Input::ConsumeBrace) || depth > 0)
+ && input.step(|cursor| match cursor.group(Delimiter::Brace) {
+ Some((_inside, _span, rest)) => Ok((true, rest)),
+ None => Ok((false, *cursor)),
+ })?
+ }
+ Input::ConsumeDelimiter => input.step(|cursor| match cursor.any_group() {
+ Some((_inside, _delimiter, _span, rest)) => Ok((true, rest)),
+ None => Ok((false, *cursor)),
+ })?,
+ Input::ConsumeIdent => input.parse::<Option<Ident>>()?.is_some(),
+ Input::ConsumeLifetime => input.parse::<Option<Lifetime>>()?.is_some(),
+ Input::ConsumeLiteral => input.parse::<Option<Lit>>()?.is_some(),
+ Input::ExpectPath => {
+ input.parse::<ExprPath>()?;
+ true
+ }
+ Input::ExpectTurbofish => {
+ if input.peek(Token![::]) {
+ input.parse::<AngleBracketedGenericArguments>()?;
+ }
+ true
+ }
+ Input::ExpectType => {
+ Type::without_plus(input)?;
+ true
+ }
+ Input::CanBeginExpr => Expr::peek(input),
+ Input::Otherwise => true,
+ Input::Empty => input.is_empty() || input.peek(Token![,]),
+ } {
+ state = match rule.1 {
+ Action::SetState(next) => next,
+ Action::IncDepth => (depth += 1, &INIT).1,
+ Action::DecDepth => (depth -= 1, &POSTFIX).1,
+ Action::Finish => return if depth == 0 { Ok(()) } else { break },
+ };
+ continue 'table;
+ }
+ }
+ return Err(input.error("unsupported expression"));
+ }
+}
diff --git a/vendor/thiserror-impl/src/unraw.rs b/vendor/thiserror-impl/src/unraw.rs
new file mode 100644
index 00000000..73b9970a
--- /dev/null
+++ b/vendor/thiserror-impl/src/unraw.rs
@@ -0,0 +1,142 @@
+use proc_macro2::{Ident, Span, TokenStream};
+use quote::ToTokens;
+use std::cmp::Ordering;
+use std::fmt::{self, Display};
+use std::hash::{Hash, Hasher};
+use syn::ext::IdentExt as _;
+use syn::parse::{Parse, ParseStream, Result};
+use syn::Index;
+
+#[derive(Clone)]
+#[repr(transparent)]
+pub struct IdentUnraw(Ident);
+
+impl IdentUnraw {
+ pub fn new(ident: Ident) -> Self {
+ IdentUnraw(ident)
+ }
+
+ pub fn to_local(&self) -> Ident {
+ let unraw = self.0.unraw();
+ let repr = unraw.to_string();
+ if syn::parse_str::<Ident>(&repr).is_err() {
+ if let "_" | "super" | "self" | "Self" | "crate" = repr.as_str() {
+ // Some identifiers are never allowed to appear as raw, like r#self and r#_.
+ } else {
+ return Ident::new_raw(&repr, Span::call_site());
+ }
+ }
+ unraw
+ }
+
+ pub fn set_span(&mut self, span: Span) {
+ self.0.set_span(span);
+ }
+}
+
+impl Display for IdentUnraw {
+ fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+ Display::fmt(&self.0.unraw(), formatter)
+ }
+}
+
+impl Eq for IdentUnraw {}
+
+impl PartialEq for IdentUnraw {
+ fn eq(&self, other: &Self) -> bool {
+ PartialEq::eq(&self.0.unraw(), &other.0.unraw())
+ }
+}
+
+impl PartialEq<str> for IdentUnraw {
+ fn eq(&self, other: &str) -> bool {
+ self.0 == other
+ }
+}
+
+impl Ord for IdentUnraw {
+ fn cmp(&self, other: &Self) -> Ordering {
+ Ord::cmp(&self.0.unraw(), &other.0.unraw())
+ }
+}
+
+impl PartialOrd for IdentUnraw {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ Some(Self::cmp(self, other))
+ }
+}
+
+impl Parse for IdentUnraw {
+ fn parse(input: ParseStream) -> Result<Self> {
+ input.call(Ident::parse_any).map(IdentUnraw::new)
+ }
+}
+
+impl ToTokens for IdentUnraw {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ self.0.unraw().to_tokens(tokens);
+ }
+}
+
+#[derive(Clone)]
+pub enum MemberUnraw {
+ Named(IdentUnraw),
+ Unnamed(Index),
+}
+
+impl MemberUnraw {
+ pub fn span(&self) -> Span {
+ match self {
+ MemberUnraw::Named(ident) => ident.0.span(),
+ MemberUnraw::Unnamed(index) => index.span,
+ }
+ }
+}
+
+impl Display for MemberUnraw {
+ fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+ match self {
+ MemberUnraw::Named(this) => Display::fmt(this, formatter),
+ MemberUnraw::Unnamed(this) => Display::fmt(&this.index, formatter),
+ }
+ }
+}
+
+impl Eq for MemberUnraw {}
+
+impl PartialEq for MemberUnraw {
+ fn eq(&self, other: &Self) -> bool {
+ match (self, other) {
+ (MemberUnraw::Named(this), MemberUnraw::Named(other)) => this == other,
+ (MemberUnraw::Unnamed(this), MemberUnraw::Unnamed(other)) => this == other,
+ _ => false,
+ }
+ }
+}
+
+impl PartialEq<str> for MemberUnraw {
+ fn eq(&self, other: &str) -> bool {
+ match self {
+ MemberUnraw::Named(this) => this == other,
+ MemberUnraw::Unnamed(_) => false,
+ }
+ }
+}
+
+impl Hash for MemberUnraw {
+ fn hash<H: Hasher>(&self, hasher: &mut H) {
+ match self {
+ MemberUnraw::Named(ident) => ident.0.unraw().hash(hasher),
+ MemberUnraw::Unnamed(index) => index.hash(hasher),
+ }
+ }
+}
+
+impl ToTokens for MemberUnraw {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ match self {
+ MemberUnraw::Named(ident) => ident.to_local().to_tokens(tokens),
+ MemberUnraw::Unnamed(index) => index.to_tokens(tokens),
+ }
+ }
+}
diff --git a/vendor/thiserror-impl/src/valid.rs b/vendor/thiserror-impl/src/valid.rs
new file mode 100644
index 00000000..21bd885e
--- /dev/null
+++ b/vendor/thiserror-impl/src/valid.rs
@@ -0,0 +1,248 @@
+use crate::ast::{Enum, Field, Input, Struct, Variant};
+use crate::attr::Attrs;
+use syn::{Error, GenericArgument, PathArguments, Result, Type};
+
+impl Input<'_> {
+ pub(crate) fn validate(&self) -> Result<()> {
+ match self {
+ Input::Struct(input) => input.validate(),
+ Input::Enum(input) => input.validate(),
+ }
+ }
+}
+
+impl Struct<'_> {
+ fn validate(&self) -> Result<()> {
+ check_non_field_attrs(&self.attrs)?;
+ if let Some(transparent) = self.attrs.transparent {
+ if self.fields.len() != 1 {
+ return Err(Error::new_spanned(
+ transparent.original,
+ "#[error(transparent)] requires exactly one field",
+ ));
+ }
+ if let Some(source) = self.fields.iter().find_map(|f| f.attrs.source) {
+ return Err(Error::new_spanned(
+ source.original,
+ "transparent error struct can't contain #[source]",
+ ));
+ }
+ }
+ if let Some(fmt) = &self.attrs.fmt {
+ return Err(Error::new_spanned(
+ fmt.original,
+ "#[error(fmt = ...)] is only supported in enums; for a struct, handwrite your own Display impl",
+ ));
+ }
+ check_field_attrs(&self.fields)?;
+ for field in &self.fields {
+ field.validate()?;
+ }
+ Ok(())
+ }
+}
+
+impl Enum<'_> {
+ fn validate(&self) -> Result<()> {
+ check_non_field_attrs(&self.attrs)?;
+ let has_display = self.has_display();
+ for variant in &self.variants {
+ variant.validate()?;
+ if has_display
+ && variant.attrs.display.is_none()
+ && variant.attrs.transparent.is_none()
+ && variant.attrs.fmt.is_none()
+ {
+ return Err(Error::new_spanned(
+ variant.original,
+ "missing #[error(\"...\")] display attribute",
+ ));
+ }
+ }
+ Ok(())
+ }
+}
+
+impl Variant<'_> {
+ fn validate(&self) -> Result<()> {
+ check_non_field_attrs(&self.attrs)?;
+ if self.attrs.transparent.is_some() {
+ if self.fields.len() != 1 {
+ return Err(Error::new_spanned(
+ self.original,
+ "#[error(transparent)] requires exactly one field",
+ ));
+ }
+ if let Some(source) = self.fields.iter().find_map(|f| f.attrs.source) {
+ return Err(Error::new_spanned(
+ source.original,
+ "transparent variant can't contain #[source]",
+ ));
+ }
+ }
+ check_field_attrs(&self.fields)?;
+ for field in &self.fields {
+ field.validate()?;
+ }
+ Ok(())
+ }
+}
+
+impl Field<'_> {
+ fn validate(&self) -> Result<()> {
+ if let Some(unexpected_display_attr) = if let Some(display) = &self.attrs.display {
+ Some(display.original)
+ } else if let Some(fmt) = &self.attrs.fmt {
+ Some(fmt.original)
+ } else {
+ None
+ } {
+ return Err(Error::new_spanned(
+ unexpected_display_attr,
+ "not expected here; the #[error(...)] attribute belongs on top of a struct or an enum variant",
+ ));
+ }
+ Ok(())
+ }
+}
+
+fn check_non_field_attrs(attrs: &Attrs) -> Result<()> {
+ if let Some(from) = &attrs.from {
+ return Err(Error::new_spanned(
+ from.original,
+ "not expected here; the #[from] attribute belongs on a specific field",
+ ));
+ }
+ if let Some(source) = &attrs.source {
+ return Err(Error::new_spanned(
+ source.original,
+ "not expected here; the #[source] attribute belongs on a specific field",
+ ));
+ }
+ if let Some(backtrace) = &attrs.backtrace {
+ return Err(Error::new_spanned(
+ backtrace,
+ "not expected here; the #[backtrace] attribute belongs on a specific field",
+ ));
+ }
+ if attrs.transparent.is_some() {
+ if let Some(display) = &attrs.display {
+ return Err(Error::new_spanned(
+ display.original,
+ "cannot have both #[error(transparent)] and a display attribute",
+ ));
+ }
+ if let Some(fmt) = &attrs.fmt {
+ return Err(Error::new_spanned(
+ fmt.original,
+ "cannot have both #[error(transparent)] and #[error(fmt = ...)]",
+ ));
+ }
+ } else if let (Some(display), Some(_)) = (&attrs.display, &attrs.fmt) {
+ return Err(Error::new_spanned(
+ display.original,
+ "cannot have both #[error(fmt = ...)] and a format arguments attribute",
+ ));
+ }
+
+ Ok(())
+}
+
+fn check_field_attrs(fields: &[Field]) -> Result<()> {
+ let mut from_field = None;
+ let mut source_field = None;
+ let mut backtrace_field = None;
+ let mut has_backtrace = false;
+ for field in fields {
+ if let Some(from) = field.attrs.from {
+ if from_field.is_some() {
+ return Err(Error::new_spanned(
+ from.original,
+ "duplicate #[from] attribute",
+ ));
+ }
+ from_field = Some(field);
+ }
+ if let Some(source) = field.attrs.source {
+ if source_field.is_some() {
+ return Err(Error::new_spanned(
+ source.original,
+ "duplicate #[source] attribute",
+ ));
+ }
+ source_field = Some(field);
+ }
+ if let Some(backtrace) = field.attrs.backtrace {
+ if backtrace_field.is_some() {
+ return Err(Error::new_spanned(
+ backtrace,
+ "duplicate #[backtrace] attribute",
+ ));
+ }
+ backtrace_field = Some(field);
+ has_backtrace = true;
+ }
+ if let Some(transparent) = field.attrs.transparent {
+ return Err(Error::new_spanned(
+ transparent.original,
+ "#[error(transparent)] needs to go outside the enum or struct, not on an individual field",
+ ));
+ }
+ has_backtrace |= field.is_backtrace();
+ }
+ if let (Some(from_field), Some(source_field)) = (from_field, source_field) {
+ if from_field.member != source_field.member {
+ return Err(Error::new_spanned(
+ from_field.attrs.from.unwrap().original,
+ "#[from] is only supported on the source field, not any other field",
+ ));
+ }
+ }
+ if let Some(from_field) = from_field {
+ let max_expected_fields = match backtrace_field {
+ Some(backtrace_field) => 1 + (from_field.member != backtrace_field.member) as usize,
+ None => 1 + has_backtrace as usize,
+ };
+ if fields.len() > max_expected_fields {
+ return Err(Error::new_spanned(
+ from_field.attrs.from.unwrap().original,
+ "deriving From requires no fields other than source and backtrace",
+ ));
+ }
+ }
+ if let Some(source_field) = source_field.or(from_field) {
+ if contains_non_static_lifetime(source_field.ty) {
+ return Err(Error::new_spanned(
+ &source_field.original.ty,
+ "non-static lifetimes are not allowed in the source of an error, because std::error::Error requires the source is dyn Error + 'static",
+ ));
+ }
+ }
+ Ok(())
+}
+
+fn contains_non_static_lifetime(ty: &Type) -> bool {
+ match ty {
+ Type::Path(ty) => {
+ let bracketed = match &ty.path.segments.last().unwrap().arguments {
+ PathArguments::AngleBracketed(bracketed) => bracketed,
+ _ => return false,
+ };
+ for arg in &bracketed.args {
+ match arg {
+ GenericArgument::Type(ty) if contains_non_static_lifetime(ty) => return true,
+ GenericArgument::Lifetime(lifetime) if lifetime.ident != "static" => {
+ return true
+ }
+ _ => {}
+ }
+ }
+ false
+ }
+ Type::Reference(ty) => ty
+ .lifetime
+ .as_ref()
+ .map_or(false, |lifetime| lifetime.ident != "static"),
+ _ => false, // maybe implement later if there are common other cases
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2026-02-02 14:32:20 +0000