1 files changed, 14 insertions, 0 deletions
diff --git a/tests/ui/unsafe/unsafe-trait-impl.rs b/tests/ui/unsafe/unsafe-trait-impl.rs
new file mode 100644
index 00000000000..1fc84ca0256
--- /dev/null
+++ b/tests/ui/unsafe/unsafe-trait-impl.rs
@@ -0,0 +1,14 @@
+// Check that safe fns are not a subtype of unsafe fns.
+
+trait Foo {
+    unsafe fn len(&self) -> u32;
+}
+
+impl Foo for u32 {
+    fn len(&self) -> u32 { *self }
+    //~^ ERROR method `len` has an incompatible type for trait
+    //~| expected signature `unsafe fn(&u32) -> _`
+    //~| found signature `fn(&u32) -> _`
+}
+
+fn main() { }