[clang] [Clang][Parser] Remove the concept from the DeclContext if the definition is invalid (PR #111179)

[via cfe-commits]

================
@@ -337,6 +343,8 @@ Parser::ParseConceptDefinition(const ParsedTemplateInfo 
&TemplateInfo,
   ExprResult ConstraintExprResult =
       Actions.CorrectDelayedTyposInExpr(ParseConstraintExpression());
   if (ConstraintExprResult.isInvalid()) {
+    if (AddedToScope)
----------------
cor3ntin wrote:

Can we just mark the decl invalid?

https://github.com/llvm/llvm-project/pull/111179
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