syntax: fix span for obsolete extern visibility error #8060
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bors
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flip1995
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…le_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: rust-lang#8060 changelog: Escape backslash in ``[`single_char_pattern`]``
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