Auto merge of #86532 - estebank:delete-suggestion-underline, r=petrochenkov

Make deleted code in a suggestion clearer

Show suggestions that include deletions in a way similar to `diff`'s output.

<img width="628" alt="" src="https://user-images.githubusercontent.com/1606434/123350316-9078e580-d50f-11eb-89b9-78431b85e23f.png">

For changes that do not have deletions, use `+` as an underline for additions and `~` as an underline for replacements.

<img width="631" alt="" src="https://user-images.githubusercontent.com/1606434/123701745-1ac68f80-d817-11eb-950b-09e5afd7532f.png">

For multiline suggestions, we now use `~` in the gutter to signal replacements and `+` to signal whole line replacements/additions.

<img width="834" alt="" src="https://user-images.githubusercontent.com/1606434/123701331-8eb46800-d816-11eb-9dcd-ef9098071afb.png">

In all cases we now use color to highlight the specific spans and snippets.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/test/ui/implicit-method-bind.stderr b/src/test/ui/implicit-method-bind.stderr
index c6af47805ea..e0a96852720 100644
--- a/src/test/ui/implicit-method-bind.stderr
+++ b/src/test/ui/implicit-method-bind.stderr
@@ -7,7 +7,7 @@ LL |     let _f = 10i32.abs;
 help: use parentheses to call the method
    |
 LL |     let _f = 10i32.abs();
-   |                       ^^
+   |                       ++
 
 error: aborting due to previous error