1 files changed, 31 insertions, 0 deletions
diff --git a/third_party/rust/num-derive/src/test.rs b/third_party/rust/num-derive/src/test.rs
new file mode 100644
index 0000000000..c4cd7fe528
--- /dev/null
+++ b/third_party/rust/num-derive/src/test.rs
@@ -0,0 +1,31 @@
+//! This module uses doc-tests on modules for `compile_fail`
+
+// We need "syn/full" to parse macros.
+// Use `--nocapture` to check the quality of the error message.
+#[cfg(not(feature = "full-syntax"))]
+/// ```compile_fail
+/// macro_rules! get_an_isize {
+///     () => (0_isize)
+/// }
+///
+/// #[derive(num_derive::FromPrimitive)]
+/// pub enum CLikeEnum {
+///     VarA = get_an_isize!(), // error without "syn/full"
+///     VarB = 2,
+/// }
+/// ```
+mod issue16 {}
+
+#[cfg(feature = "full-syntax")]
+/// ```
+/// macro_rules! get_an_isize {
+///     () => (0_isize)
+/// }
+///
+/// #[derive(num_derive::FromPrimitive)]
+/// pub enum CLikeEnum {
+///     VarA = get_an_isize!(), // ok with "syn/full"
+///     VarB = 2,
+/// }
+/// ```
+mod issue16 {}