[clang-tools-extra] [clang-tidy] Catch <cctype> function args in bugprone-signed-char-misuse (PR #211403)

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@@ -125,11 +125,38 @@ void SignedCharMisuseCheck::registerMatchers(MatchFinder *Finder) {
           .bind("arraySubscript");
 
   Finder->addMatcher(STDArraySubscript, this);
+
+  // Catch signed char values passed to a <cctype>/<ctype.h> classification
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cavdarahmet wrote:

Done — shortened to two lines. The `hasArgument()` implementation detail was moved into `check()`, next to the code it actually explains.


https://github.com/llvm/llvm-project/pull/211403