[clang] [clang-format] Correctly annotate user-defined conversion functions (PR #131434)

[Björn Schäpers via cfe-commits]

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@@ -1639,6 +1639,25 @@ class AnnotatingParser {
     case tok::kw_operator:
       if (Style.isProto())
         break;
+      // C++ user-defined conversion function.
+      if (IsCpp && CurrentToken &&
+          (CurrentToken->is(tok::kw_auto) ||
+           CurrentToken->isTypeName(LangOpts))) {
+        FormatToken *LParen;
+        if (CurrentToken->startsSequence(tok::kw_decltype, tok::l_paren,
+                                         tok::kw_auto, tok::r_paren)) {
+          LParen = CurrentToken->Next->Next->Next->Next;
+        } else {
+          for (LParen = CurrentToken->Next;
+               LParen && LParen->isNot(tok::l_paren); LParen = LParen->Next) {
+          }
+        }
+        if (LParen && LParen->startsSequence(tok::l_paren, tok::r_paren)) {
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HazardyKnusperkeks wrote:

This does not match on `operator Foo(void)`.

https://github.com/llvm/llvm-project/pull/131434