[clang] [Clang] Fix infinite loop on '::' inside parens in C mode (PR #195377)

[Aaron Ballman via cfe-commits]

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@@ -5629,6 +5632,8 @@ bool Parser::isTypeSpecifierQualifier(const Token &Tok) {
     return isTypeSpecifierQualifier(getCurToken());
 
   case tok::coloncolon:   // ::foo::bar
+    if (!getLangOpts().CPlusPlus && !getLangOpts().ObjC)
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AaronBallman wrote:

Does Objective-C use `::` for type specifiers?

https://github.com/llvm/llvm-project/pull/195377
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