[PATCH] D65694: Properly instantiate a decltype in argument's default initializer

[Richard Smith - zygoloid via Phabricator via cfe-commits]

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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  https://reviews.llvm.org/D65694/new/

https://reviews.llvm.org/D65694