[clang] [clang][Sema] Suggest/Hint Standard Library Include File (PR #146227)

[Erich Keane via cfe-commits]

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@@ -454,6 +459,9 @@ bool Parser::ParseOptionalCXXScopeSpecifier(
       // We have an identifier followed by a '::'. Lookup this name
       // as the name in a nested-name-specifier.
       Token Identifier = Tok;
+      FullNamespace += Identifier.getIdentifierInfo()->getName();
+      FullNamespace += "::";
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erichkeane wrote:

As this is extra work, just make it a part of the printing, not here.  Better yet, instead of storing `FullNameSpace`, just store the IdentifierInfo list.

https://github.com/llvm/llvm-project/pull/146227