Auto merge of #45913 - sinkuu:mir-inlining-closure, r=arielb1

Handle closures correctly in MIR inlining

Fixes #45894.

src/test/mir-opt/inline-closure.rs

@@ -0,0 +1,42 @@
+// Copyright 2017 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.
+
+// compile-flags: -Z span_free_formats
+
+// Tests that MIR inliner can handle closure arguments. (#45894)
+
+fn main() {
+    println!("{}", foo(0, 14));
+}
+
+fn foo<T: Copy>(_t: T, q: i32) -> i32 {
+    let x = |_t, _q| _t;
+    x(q, q)
+}
+
+// END RUST SOURCE
+// START rustc.foo.Inline.after.mir
+// ...
+// bb0: {
+//     ...
+//     _3 = [closure@NodeId(28)];
+//     ...
+//     _4 = &_3;
+//     ...
+//     _6 = _2;
+//     ...
+//     _7 = _2;
+//     _5 = (_6, _7);
+//     _0 = (_5.0: i32);
+//     ...
+//     return;
+// }
+// ...
+// END rustc.foo.Inline.after.mir