rsmith added a comment. This isn't the right approach: instead of re-instantiating the parameter when we encounter a use of it, we should inject the parameters into the local instantiation scope before trying to instantiate a default argument (`Sema::CheckCXXDefaultArgExpr` should call `addInstantiatedParametersToScope` to populate the `LocalInstantiationScope` before calling `SubstInitializer`).
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