================
@@ -1111,12 +1111,57 @@ bool Sema::EnsureTemplateArgumentListConstraints(
   return false;
 }
 
-bool Sema::CheckInstantiatedFunctionTemplateConstraints(
+static bool CheckFunctionConstraintsWithoutInstantiation(
+    Sema &SemaRef, SourceLocation PointOfInstantiation,
+    FunctionTemplateDecl *Template, ArrayRef<TemplateArgument> TemplateArgs,
+    ConstraintSatisfaction &Satisfaction) {
+  SmallVector<const Expr *, 3> TemplateAC;
+  Template->getAssociatedConstraints(TemplateAC);
+  if (TemplateAC.empty()) {
+    Satisfaction.IsSatisfied = true;
+    return false;
+  }
+
+  LocalInstantiationScope Scope(SemaRef);
+
+  FunctionDecl *FD = Template->getTemplatedDecl();
+  // Collect the list of template arguments relative to the 'primary'
+  // template. We need the entire list, since the constraint is completely
+  // uninstantiated at this point.
+
+  // FIXME: Add TemplateArgs through the 'Innermost' parameter once
+  // the refactoring of getTemplateInstantiationArgs() relands.
+  MultiLevelTemplateArgumentList MLTAL;
+  MLTAL.addOuterTemplateArguments(Template, /*Args=*/TemplateArgs,
----------------
zyn0217 wrote:

> Remind me what stops us to use Innermost here?

Friends. They need a LexicalDeclContext as the next stop, while that function 
always navigate to the Semantic DeclContext when Innermost is present.

(I tried to tweak that behavior months ago, but it was quickly superseded by 
@sdkrystian's work)

https://github.com/llvm/llvm-project/pull/102857
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