https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82579

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is not a GCC bug, because it's the required behaviour for C++17.

Use -fno-new-ttp-matching to disable it in C++17 (or use -fnew-ttp-matching to
enable it in C++14 and make it ambiguous).

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