================
@@ -353,6 +353,10 @@ static ExprResult calculateConstraintSatisfaction(
if (Inst.isInvalid())
return ExprError();
+ // An empty expression for substitution failure messages.
+ if (Template && Template->isInvalidDecl())
+ return ExprEmpty();
----------------
cor3ntin wrote:
Can you explain why not return ExprError here? Does it just produce more
diagnostics?
https://github.com/llvm/llvm-project/pull/75697
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