[llvm-bugs] [Bug 35793] New: [modules] identical declarations do not match

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35793

            Bug ID: 35793
           Summary: [modules] identical declarations do not match
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Modules
          Assignee: unassignedclangbugs at nondot.org
          Reporter: gonzalobg88 at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

The error in a nutshell:


In module 'bar' imported from foo.hpp:6:
c++/v1/tuple:1015:25: error:
'std::__1::__find_detail::__find_exactly_one_checked::__matches' from module
'bar' is not
      present in definition of '__find_exactly_one_checked<_T1, _Args...>'
provided earlier
  static constexpr bool __matches[] = {is_same<_T1, _Args>::value...};
                        ^
c++/v1/tuple:1015:25: note: declaration of '__matches' does not match
  static constexpr bool __matches[] = {is_same<_T1, _Args>::value...};
                        ^

I am trying to come up with a MWE but compiling with  -E -frewrite-imports (or
-P -E -frewrite-imports -fno-rewrite-includes) generates a file that does not
contain the error. 

Any ideas on how to proceed?

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