[llvm-bugs] [Bug 41867] New: "note: member call on member 'endpoint' of union with active member 'interface' is not allowed in a constant expression" note should include the member name

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41867

            Bug ID: 41867
           Summary: "note: member call on member 'endpoint' of union with
                    active member 'interface' is not allowed in a constant
                    expression" note should include the member name
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: phosek at chromium.org
                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

With the tip-of-tree Clang, this is failing to compile because the
-Winvalid-constexpr has gotten more strict after r360499
(https://github.com/llvm/llvm-project/commit/d05df0ef4362855405ae1df76572909fb0ff55b2):

  usb-mass-storage.cpp:30:37: error: constexpr function never produces a
constant expression [-Winvalid-constexpr]
      static constexpr usb_descriptor Create(usb_endpoint_descriptor_t
descriptor) {
                                      ^
  usb-mass-storage.cpp:32:25: note: member call on member 'endpoint' of union
with active member 'interface' is not allowed in a constant expression
          retval.endpoint = descriptor;
                          ^
  1 error generated.

It would be useful if the note also included the name of the member which is
being called (in this case it's operator= but that's not completely obvious
from the message).

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