1 files changed, 25 insertions, 0 deletions
diff --git a/src/test/ui/argument-suggestions/formal-and-expected-differ.rs b/src/test/ui/argument-suggestions/formal-and-expected-differ.rs
new file mode 100644
index 000000000..5e3b55ca5
--- /dev/null
+++ b/src/test/ui/argument-suggestions/formal-and-expected-differ.rs
@@ -0,0 +1,25 @@
+pub trait Foo {
+    type T;
+}
+
+impl Foo for i32 {
+    type T = f32;
+}
+
+pub struct U<T1, T2>(T1, S<T2>)
+where
+    T1: Foo<T = T2>;
+
+pub struct S<T>(T);
+
+fn main() {
+    // The error message here isn't great -- it has to do with the fact that the
+    // `expected_inputs_for_expected_output` deduced inputs differs from the inputs
+    // that we infer from the constraints of the signature.
+    //
+    // I am not really sure what the best way of presenting this error message is,
+    // since right now it just suggests changing `3u32` <=> `3f32` back and forth.
+    let _: U<_, u32> = U(1, S(3u32));
+    //~^ ERROR mismatched types
+    //~| ERROR mismatched types
+}