Remove an overly pedantic and wrong assertion

src/librustc_mir/transform/const_prop.rs

@@ -333,11 +333,6 @@ impl<'b, 'a, 'tcx:'b> ConstPropagator<'b, 'a, 'tcx> {
     ) -> Option<Const<'tcx>> {
         let span = source_info.span;
         match *rvalue {
-            // This branch exists for the sanity type check
-            Rvalue::Use(Operand::Constant(ref c)) => {
-                assert_eq!(c.ty, place_layout.ty);
-                self.eval_constant(c, source_info)
-            },
             Rvalue::Use(ref op) => {
                 self.eval_operand(op, source_info)
             },

src/test/ui/const-eval/issue-53157.rs

@@ -0,0 +1,23 @@
+// Copyright 2018 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-pass
+
+macro_rules! m {
+    () => {{
+        fn f(_: impl Sized) {}
+        f
+    }}
+}
+
+fn main() {
+    fn f() -> impl Sized {};
+    m!()(f());
+}