1 files changed, 17 insertions, 0 deletions
diff --git a/third_party/rust/num-derive/tests/issue-6.rs b/third_party/rust/num-derive/tests/issue-6.rs
new file mode 100644
index 0000000000..9eae7fb3f5
--- /dev/null
+++ b/third_party/rust/num-derive/tests/issue-6.rs
@@ -0,0 +1,17 @@
+#![deny(trivial_numeric_casts)]
+
+#[macro_use]
+extern crate num_derive;
+
+#[derive(FromPrimitive, ToPrimitive)]
+pub enum SomeEnum {
+    A = 1,
+}
+
+#[test]
+fn test_trivial_numeric_casts() {
+    use num::{FromPrimitive, ToPrimitive};
+    assert!(SomeEnum::from_u64(1).is_some());
+    assert!(SomeEnum::from_i64(-1).is_none());
+    assert_eq!(SomeEnum::A.to_u64(), Some(1));
+}