[C++ PATCH] PR c++/86969 - ICE with constexpr if and recursive generic lambdas.

[Jason Merrill]

On Wed, Feb 27, 2019 at 4:54 PM Jason Merrill <jason@redhat.com> wrote:
>
> Immediately capturing a VLA means we need to create a dependent VLA capture
> type, and not in the context of the lambda op(), since trying to look up the
> instantiation of the op() while we're substituting into the capture list
> would crash.  So I force TYPE_CONTEXT and the binding level out to the
> enclosing function before pushtag, avoid adding a TAG_DEFN, and instead
> force the type to be complete in tsubst_lambda_expr.

...or we could delay doing the special VLA handling until its type
becomes non-dependent, which is a lot simpler and less kludgey.

Tested x86_64-pc-linux-gnu, applying to trunk.
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