Richard Smith 6bbfa0fd40 When performing template argument deduction to select a partial ...

specialization while substituting a partial template parameter pack,
don't try to extend the existing deduction.

This caused us to select the wrong partial specialization in some rare
cases. A recent change to libc++ caused this to happen in practice for
code using std::conjunction.

2021-05-05 14:47:18 -07:00

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