Rollup merge of #49157 - estebank:const-into, r=oli-obk

Do not suggest `.into()` in `const`s

Fix #49100.

src/test/ui/suggestions/const-type-mismatch.rs

@@ -0,0 +1,21 @@
+// 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.
+
+// `const`s shouldn't suggest `.into()`
+
+const TEN: u8 = 10;
+const TWELVE: u16 = TEN + 2;
+//~^ ERROR mismatched types [E0308]
+
+fn main() {
+    const TEN: u8 = 10;
+    const ALSO_TEN: u16 = TEN;
+    //~^ ERROR mismatched types [E0308]
+}

src/test/ui/suggestions/const-type-mismatch.stderr

@@ -0,0 +1,15 @@
+error[E0308]: mismatched types
+  --> $DIR/const-type-mismatch.rs:14:21
+   |
+LL | const TWELVE: u16 = TEN + 2;
+   |                     ^^^^^^^ expected u16, found u8
+
+error[E0308]: mismatched types
+  --> $DIR/const-type-mismatch.rs:19:27
+   |
+LL |     const ALSO_TEN: u16 = TEN;
+   |                           ^^^ expected u16, found u8
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0308`.