1 files changed, 96 insertions, 0 deletions
diff --git a/vendor/nonempty/src/nonzero.rs b/vendor/nonempty/src/nonzero.rs
new file mode 100644
index 00000000..4d611022
--- /dev/null
+++ b/vendor/nonempty/src/nonzero.rs
@@ -0,0 +1,96 @@
+#[cfg(feature = "arbitrary")]
+use arbitrary::Arbitrary;
+use std::num::NonZeroUsize;
+
+/// A non-empty list which statically guarantees certain operations
+/// cannot return zero, using [`std::num::NonZeroUsize`].
+///
+/// *Experimental*
+///
+#[repr(transparent)]
+#[cfg_attr(feature = "arbitrary", derive(Arbitrary))]
+#[derive(Clone, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
+pub struct NonEmpty<T>(super::NonEmpty<T>);
+
+impl<T> NonEmpty<T> {
+    /// Get the length of the list.
+    pub fn len(&self) -> NonZeroUsize {
+        unsafe { NonZeroUsize::new_unchecked(self.0.tail.len() + 1) }
+    }
+
+    /// Get the capacity of the list.
+    pub fn capacity(&self) -> NonZeroUsize {
+        unsafe { NonZeroUsize::new_unchecked(self.0.tail.capacity() + 1) }
+    }
+
+    /// Truncate the list to a certain size.
+    pub fn truncate(&mut self, len: NonZeroUsize) {
+        self.tail.truncate(usize::from(len) - 1);
+    }
+}
+
+impl<T> From<super::NonEmpty<T>> for NonEmpty<T> {
+    fn from(other: super::NonEmpty<T>) -> NonEmpty<T> {
+        NonEmpty(other)
+    }
+}
+
+impl<T> std::ops::Deref for NonEmpty<T> {
+    type Target = super::NonEmpty<T>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl<T> std::ops::DerefMut for NonEmpty<T> {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::nonzero;
+    use crate::NonEmpty;
+
+    use std::convert::TryInto;
+
+    #[test]
+    fn test_nonzero() {
+        let nonempty: nonzero::NonEmpty<_> = NonEmpty::from((0, vec![1, 2, 3])).into();
+
+        assert_eq!(nonempty.len(), 4.try_into().unwrap());
+        assert_eq!(nonempty.capacity(), 4.try_into().unwrap());
+    }
+
+    #[cfg(feature = "arbitrary")]
+    mod arbitrary {
+        use crate::nonzero;
+        use arbitrary::{Arbitrary, Unstructured};
+
+        use std::convert::TryInto;
+
+        #[test]
+        fn test_nonzero_arbitrary_empty_tail() -> arbitrary::Result<()> {
+            let mut u = Unstructured::new(&[1, 2, 3, 4]);
+            let nonempty: nonzero::NonEmpty<_> = nonzero::NonEmpty::<i32>::arbitrary(&mut u)?;
+
+            assert_eq!(nonempty.len(), 1.try_into().unwrap());
+            assert_eq!(nonempty.capacity(), 1.try_into().unwrap());
+
+            Ok(())
+        }
+
+        #[test]
+        fn test_nonzero_arbitrary_with_tail() -> arbitrary::Result<()> {
+            let mut u = Unstructured::new(&[1, 2, 3, 4, 5, 6, 7, 8]);
+            let nonempty: nonzero::NonEmpty<_> = nonzero::NonEmpty::<i32>::arbitrary(&mut u)?;
+
+            assert_eq!(nonempty.len(), 2.try_into().unwrap());
+            assert_eq!(nonempty.capacity(), 5.try_into().unwrap());
+
+            Ok(())
+        }
+    }
+}