Auto merge of #8067 - frobiac:8060-backslash_escaped_in_single_char_pattern, r=giraffate

Escape backslash in single_char_pattern.rs

Escape backslash in single_char_pattern.

Previously, the proposed clippy fix for a single backslash in raw strings ```r"\"``` or ```r#"\"#``` was also only an unescaped, *single* ```'\'```:
```shell
warning: single-character string constant used as pattern
2 |     let s = r#"abc\xyz/"#.find(r"\");
  |                                ^^^^ help: try using a `char` instead: `'\'`
  |
  = note: `#[warn(clippy::single_char_pattern)]` on by default
```

This PR corrects this to a properly escaped *double* backslash ```'\\'```.
I haven't come up with any other problematic cases, a single quote was already handled.

Closes: #8060

changelog:  Escape backslash in ``[`single_char_pattern`]``

0 files changed, 0 insertions, 0 deletions