[llvm-bugs] [Bug 47235] New: Overloaded template functions became ambiguous

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47235

            Bug ID: 47235
           Summary: Overloaded template functions became ambiguous
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: tangyixuan at mail.dlut.edu.cn
                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

Clang++ rejects the valid code as ambiguous, while g++ accepts:

$ cat s.C
template<typename T, typename U> void f(U&) { }
template<typename T, typename U> void f(T const&) { }
int main()
{
    int a;
    f<int, int const>(a);
}

$ clang++ -c s.C
s.C:6:5: error: call to 'f' is ambiguous
    f<int, int const>(a);
    ^~~~~~~~~~~~~~~~~
s.C:1:39: note: candidate function [with T = int, U = const int]
template<typename T, typename U> void f(U&) { }
                                      ^
s.C:2:39: note: candidate function [with T = int, U = const int]
template<typename T, typename U> void f(T const&) { }
                                      ^
1 error generated.

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