On 01/13/2017 09:45 AM, Paolo Carlini wrote:

in this error recovery issue get_underlying_template crashes when
TYPE_TEMPLATE_INFO_MAYBE_ALIAS is applied to a null orig_type. Simply
checking for that condition appears to solve the issue in a
straightforward way. Tested x86_64-linux.

Wouldn't it be better if a scrogged alias got error_mark_node as the underlying type? (I have no idea whether that's an easy thing to accomplish)

Nathan Sidwell

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