Add regression test for #22258

Closes #22258.

Author: jooert

src/test/run-pass/issue-22258.rs

@@ -0,0 +1,19 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use std::ops::Add;
+
+fn f<T: Add>(a: T, b: T) -> <T as Add>::Output {
+    a + b
+}
+
+fn main() {
+    println!("a + b is {}", f::<f32>(100f32, 200f32));
+}