[clang] [Clang] allow `` `@$ `` in raw string delimiters in C++26 (PR #93216)

[Aaron Ballman via cfe-commits]

================
@@ -2261,8 +2261,17 @@ bool Lexer::LexRawStringLiteral(Token &Result, const 
char *CurPtr,
 
   unsigned PrefixLen = 0;
 
-  while (PrefixLen != 16 && isRawStringDelimBody(CurPtr[PrefixLen]))
+  while (PrefixLen != 16 && isRawStringDelimBody(CurPtr[PrefixLen])) {
     ++PrefixLen;
+    if (!isLexingRawMode() &&
+        llvm::is_contained({'$', '@', '`'}, CurPtr[PrefixLen])) {
----------------
AaronBallman wrote:

Good catch, thank you! I've fixed this in 
4f09ac7705b3b24492d521a97571404c2e9a1f8e

https://github.com/llvm/llvm-project/pull/93216
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