1 files changed, 53 insertions, 0 deletions
diff --git a/tests/ui/fn/fn-item-type.rs b/tests/ui/fn/fn-item-type.rs
new file mode 100644
index 000000000..1831e6cbf
--- /dev/null
+++ b/tests/ui/fn/fn-item-type.rs
@@ -0,0 +1,53 @@
+// Test that the types of distinct fn items are not compatible by
+// default. See also `run-pass/fn-item-type-*.rs`.
+
+fn foo<T>(x: isize) -> isize { x * 2 }
+fn bar<T>(x: isize) -> isize { x * 4 }
+
+fn eq<T>(x: T, y: T) { }
+
+trait Foo { fn foo() { /* this is a default fn */ } }
+impl<T> Foo for T { /* `foo` is still default here */ }
+
+fn main() {
+    eq(foo::<u8>, bar::<u8>);
+    //~^ ERROR mismatched types
+    //~| expected fn item `fn(_) -> _ {foo::<u8>}`
+    //~| found fn item `fn(_) -> _ {bar::<u8>}`
+    //~| expected fn item, found a different fn item
+    //~| different `fn` items always have unique types, even if their signatures are the same
+    //~| change the expected type to be function pointer
+    //~| if the expected type is due to type inference, cast the expected `fn` to a function pointer
+
+    eq(foo::<u8>, foo::<i8>);
+    //~^ ERROR mismatched types
+    //~| expected `u8`, found `i8`
+    //~| different `fn` items always have unique types, even if their signatures are the same
+    //~| change the expected type to be function pointer
+    //~| if the expected type is due to type inference, cast the expected `fn` to a function pointer
+
+    eq(bar::<String>, bar::<Vec<u8>>);
+    //~^ ERROR mismatched types
+    //~| found fn item `fn(_) -> _ {bar::<Vec<u8>>}`
+    //~| expected struct `String`, found struct `Vec`
+    //~| different `fn` items always have unique types, even if their signatures are the same
+    //~| change the expected type to be function pointer
+    //~| if the expected type is due to type inference, cast the expected `fn` to a function pointer
+
+    // Make sure we distinguish between trait methods correctly.
+    eq(<u8 as Foo>::foo, <u16 as Foo>::foo);
+    //~^ ERROR mismatched types
+    //~| expected `u8`, found `u16`
+    //~| different `fn` items always have unique types, even if their signatures are the same
+    //~| change the expected type to be function pointer
+    //~| if the expected type is due to type inference, cast the expected `fn` to a function pointer
+
+    eq(foo::<u8>, bar::<u8> as fn(isize) -> isize);
+    //~^ ERROR mismatched types
+    //~| found fn pointer `fn(_) -> _`
+    //~| expected fn item, found fn pointer
+    //~| change the expected type to be function pointer
+    //~| if the expected type is due to type inference, cast the expected `fn` to a function pointer
+
+    eq(foo::<u8> as fn(isize) -> isize, bar::<u8>); // ok!
+}