[llvm-bugs] [Bug 48090] New: Non-type template argument parse error

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48090

            Bug ID: 48090
           Summary: Non-type template argument parse error
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows XP
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: oleg-derevenetz at yandex.ru
                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

Consider the following code:

namespace BitOp
{
enum Op
{
    Copy
};
};

template<typename T>
class Bits
{
public:
    template <BitOp::Op op = BitOp::Copy>
    static T& bitop(T& dst, T src) {
        if (op == BitOp::Copy)
            dst = src;
        return dst;
    };
};

template<typename T>
struct Bitmap3D
{
    template <BitOp::Op op = BitOp::Copy>
    void exportBits(T* bits) const
    {
        Bits<T>::bitop<op>(bits[0], bits[0]);
    };
};

int main(int, char *[])
{
    Bitmap3D<int> bm3d;
    int *bits;

    bm3d.exportBits(bits);
}

It fails to compile with the following error:

<source>:27:18: error: reference to overloaded function could not be resolved;
did you mean to call it?

        Bits<T>::bitop<op>(bits[0], bits[0]);

        ~~~~~~~~~^~~~~

<source>:36:10: note: in instantiation of function template specialization
'Bitmap3D<int>::exportBits<BitOp::Copy>' requested here

    bm3d.exportBits(bits);

         ^

<source>:14:15: note: possible target for call

    static T& bitop(T& dst, T src) {

              ^

1 error generated.

This code compiles just fine with MSVC 19.27 though:

https://godbolt.org/z/KqMKnv

It seems that clang parser interprets "Bits<T>::bitop<op" part like call of
operator<(Bits<T>::bitop, op), but it's just a guess.

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