[clang] [clang] more useful error message for decomposition declaration missing initializer (PR #127924)

[via cfe-commits]

================
@@ -14058,7 +14058,17 @@ void Sema::ActOnUninitializedDecl(Decl *RealDecl) {
 
     // C++1z [dcl.dcl]p1 grammar implies that an initializer is mandatory.
     if (isa<DecompositionDecl>(RealDecl)) {
-      Diag(Var->getLocation(), diag::err_decomp_decl_requires_init) << Var;
+      Preprocessor &PP = getPreprocessor();
+      SourceManager &SM = Context.getSourceManager();
+      LangOptions LO = Context.getLangOpts();
+
+      // Lexer previously checked for '=' and didn't find it
+      // Highlight the token found in its place in the error message
+      Token Tok;
+      Lexer::getRawToken(PP.getLastCachedTokenLocation(), Tok, SM, LO);
----------------
kbrav wrote:

Fixed, getting it in Parser

https://github.com/llvm/llvm-project/pull/127924