https://bugs.llvm.org/show_bug.cgi?id=40150

            Bug ID: 40150
           Summary: deleted friend of template class conflicts with its
                    own definition
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangb...@nondot.org
          Reporter: ca...@carter.net
                CC: blitzrak...@gmail.com, dgre...@apple.com,
                    erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
                    richard-l...@metafoo.co.uk

This correct TU:

    template<class>
    struct S {
        friend void operator|(int, const S&) = delete;
    };

    S<void> s;

is rejected by "clang++ -std=c++2a" (https://godbolt.org/z/Du4mGf) with
diagnostics:

    <source>:3:17: error: redefinition of 'operator|'
        friend void operator|(int, const S&) = delete;
                    ^
    <source>:6:9: note: in instantiation of template class 'S<void>' requested
here
    S<void> s;
            ^
    <source>:3:17: note: previous definition is here
        friend void operator|(int, const S&) = delete;
                    ^
    1 error generated.

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