Richard Smith bfd643353e Fix merging of two arity-only pack deductions. ...

If we deduced the arity of a pack in two different ways, but didn't
deduce an element of the pack in either of those deductions, we'd merge
that element to produce a null template argument, which we'd incorrectly
interpret as the merge having failed.

Testcase based on one supplied by Hubert Tong.

2020-07-14 10:02:07 -07:00

19 KiB

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