================
@@ -1127,9 +1148,9 @@ NumericLiteralParser::NumericLiteralParser(StringRef
TokSpelling,
// wb and WB are allowed, but a mixture of cases like Wb or wB is not. We
// explicitly do not support the suffix in C++ as an extension because a
// library-based UDL that resolves to a library type may be more
- // appropriate there.
- if (!LangOpts.CPlusPlus && ((s[0] == 'w' && s[1] == 'b') ||
- (s[0] == 'W' && s[1] == 'B'))) {
+ // appropriate there. The same rules apply for __wb/__WB.
+ if ((!LangOpts.CPlusPlus || PossibleBitInt) &&
+ ((s[0] == 'w' && s[1] == 'b') || (s[0] == 'W' && s[1] == 'B'))) {
----------------
js324 wrote:
Would the existing test cases of `1__w` and `1.0_` in `bitint-constants.cpp` be
enough to test this and the similar above comment?
https://github.com/llvm/llvm-project/pull/86586
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