Modify structured suggestion output

* On suggestions that include deletions, use a diff inspired output format * When suggesting addition, use `+` as underline * Color highlight modified span
2021-06-21 19:07:19 -07:00 · 2021-06-21 19:07:19 -07:00 · 99f2977031
commit 99f2977031
parent d488de82f3
881 changed files with 4696 additions and 3326 deletions
--- a/src/test/ui/macros/format-parse-errors.stderr
+++ b/src/test/ui/macros/format-parse-errors.stderr
@ -47,7 +47,7 @@ LL |     format!(123);
 help: you might be missing a string literal to format with
   |
 LL |     format!("{}", 123);
-   |             ^^^^^
+   |             +++++

 error: aborting due to 7 previous errors