[LLVMbugs] [Bug 13601] New: Non-intrinsic `std::is_convertible` is incorrect

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=13601

             Bug #: 13601
           Summary: Non-intrinsic `std::is_convertible` is incorrect
           Product: libc++
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
        AssignedTo: hhinnant at apple.com
        ReportedBy: mimomorin at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 9051
  --> http://llvm.org/bugs/attachment.cgi?id=9051
Fixing non-intrinsic `is_convertible` for C++11

Non-intrinsic version of `std::is_convertible` works incorrectly. 
For example, 
* `is_convertible<Func, Func&>` returns false_type for a function type `Func`.
* `is_convertible<int&, int&>` returns false_type in a C++11 mode.
Attached a patch for C++11.

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