[llvm-bugs] [Bug 40610] New: use of overloaded operator '[]' is ambiguous (with template conversion operator)

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40610

            Bug ID: 40610
           Summary: use of overloaded operator '[]' is ambiguous (with
                    template conversion operator)
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangb...@nondot.org
          Reporter: chabs...@gmail.com
                CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org,
                    neeil...@live.com, richard-l...@metafoo.co.uk

#include <type_traits>

struct abc
{
    operator bool *() { return {}; }
    template <typename T> operator T *() { return {}; }
    //template <typename T, typename U = std::enable_if_t<std::is_same_v<T,
std::remove_cv_t<T>>> > operator T *() = delete;
};

int main() {
    abc{}[0];
    return 0;
}


#1 with x86-64 clang 7.0.0
<source>:11:10: error: use of overloaded operator '[]' is ambiguous (with
operand types 'abc' and 'int')

    abc{}[0];

    ~~~~~^~

<source>:11:10: note: built-in candidate operator[](_Bool *, long)

<source>:11:10: note: built-in candidate operator[](const _Bool *, long)

<source>:11:10: note: built-in candidate operator[](volatile _Bool *, long)

<source>:11:10: note: built-in candidate operator[](const volatile _Bool *,
long)

If second template is used instead - it compiles just fine.

GCC, MSVC and ICC all are happy with this code.

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