Diffs from UI tests are noisy when line numbers change #46643
Description
Here's a typical example: #46640
One line added at the start of the test source (// must-compile-successfully) causes changes in all line numbers in the test's output.
warning: unreachable pattern
- --> $DIR/issue-43253.rs:37:9
+ --> $DIR/issue-43253.rs:39:9
|
-37 | 9 => {},
+39 | 9 => {},
| ^
|
note: lint level defined here
- --> $DIR/issue-43253.rs:12:9
+ --> $DIR/issue-43253.rs:14:9
|
-12 | #![warn(unreachable_patterns)]
+14 | #![warn(unreachable_patterns)]
| ^^^^^^^^^^^^^^^^^^^^
warning: unreachable pattern
- --> $DIR/issue-43253.rs:43:9
+ --> $DIR/issue-43253.rs:45:9
|
-43 | 8...9 => {},
+45 | 8...9 => {},
| ^^^^^
warning: unreachable pattern
- --> $DIR/issue-43253.rs:49:9
+ --> $DIR/issue-43253.rs:51:9
|
-49 | 9...9 => {},
+51 | 9...9 => {},
| ^^^^^There are probably tests in which specific values of line numbers are important, but maybe they can be replaced with some placeholder by default?