[llvm-bugs] [Bug 44517] New: Stop adding new type traits builtins without adding __has_feature support for them

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44517

            Bug ID: 44517
           Summary: Stop adding new type traits builtins without adding
                    __has_feature support for them
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: brycelelbach at gmail.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

We seem to be forgetting to update __has_feature when adding new type traits
builtins.

__has_feature works with most type traits builtins, but not __is_function,
__is_assignable, or __is_nothrow_constructible.

This is a bit of a pain for us in libc++.

https://godbolt.org/z/iuVLDe

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