================
@@ -1241,7 +1260,9 @@ bool NumericLiteralParser::isValidUDSuffix(const
LangOptions &LangOpts,
return false;
// By C++11 [lex.ext]p10, ud-suffixes starting with an '_' are always valid.
- if (Suffix[0] == '_')
+ // Suffixes starting with '__' (double underscore) are for use by
+ // implementation.
+ if (Suffix[0] == '_' && Suffix[1] != '_')
----------------
AaronBallman wrote:
Example code that causes an assertion now:
```
unsigned operator ""_(const char *);
unsigned i = 1_;
```
https://github.com/llvm/llvm-project/pull/86586
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