================
@@ -7963,6 +7967,148 @@ static Attr *getCCTypeAttr(ASTContext &Ctx, ParsedAttr 
&Attr) {
   llvm_unreachable("unexpected attribute kind!");
 }
 
+ExprResult Sema::ActOnEffectExpression(Expr *CondExpr, FunctionEffectMode 
&Mode,
+                                       bool RequireConstexpr) {
+  // see checkFunctionConditionAttr, Sema::CheckCXXBooleanCondition
+  if (RequireConstexpr || !CondExpr->isTypeDependent()) {
+    ExprResult E = PerformContextuallyConvertToBool(CondExpr);
+    if (E.isInvalid())
+      return E;
+    CondExpr = E.get();
+    if (RequireConstexpr || !CondExpr->isValueDependent()) {
+      llvm::APSInt CondInt;
+      E = VerifyIntegerConstantExpression(
----------------
Sirraide wrote:

> Is there a way at this time to detect that the expression is not only 
> dependent but an unexpanded pack?

Iirc pack dependence is a thing. You should be able to check for that.

> If I add void g() { f<true, false>(); } there is a second attempt to resolve 
> the expression but it is still dependent, so clearly there is an error here

I’ll have to check how we currently handle these cases because I’m not terribly 
familiar w/ packs myself.

https://github.com/llvm/llvm-project/pull/84983
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