testsuite: Add compile-fail test for #5883 #7863
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bors
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flip1995
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Properly consider uncased and titlecased characters. Fixes rust-lang#7863.
flip1995
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…r=xFrednet Fix `match_str_case_mismatch` on uncased chars False positives would result because `char::is_lowercase` and friends will return `false` for non-alphabetic chars and alphabetic chars lacking case (such as CJK scripts). Care also has to be taken for handling titlecase characters (`Dz`) and lowercased chars with no uppercase equivalent (`ʁ`). For example, when verifying lowercase: * Check `!any(char::is_ascii_uppercase)` instead of `all(char::is_ascii_lowercase)` for ASCII. * Check that `all(|c| c.to_lowercase() == c)` instead of `all(char::is_lowercase)` for non-ASCII Fixes rust-lang#7863. changelog: Fix false positives in [`match_str_case_mismatch`] on uncased characters
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