[llvm-bugs] [Bug 128902] The presence of an overloaded operator in the same namespace prevents implicit conversions from occurring

[LLVM Bugs via llvm-bugs]

Issue	128902
Summary	The presence of an overloaded operator in the same namespace prevents implicit conversions from occurring
Labels	new issue
Assignees
Reporter	PiliLatiesa

    The following example is rejected by Clang++, while accepted by G++, MSVC, and the EDG compiler.

```c++
namespace VF
{
  struct FloatWrapper
  {
    double Data;

    constexpr FloatWrapper() = default;

    constexpr FloatWrapper(double const Data_) :
      Data{Data_} {}

    constexpr operator double const &() const
 { return Data; }

    constexpr operator double &()
      { return Data; }
  };


  template<typename T>
  concept CExpr = false;

 template<CExpr T>
  int operator +(T const &lhs, int const rhs) // Comment out this operator to make the example compile
    { return 6; }

} // VF

int main()
{
  VF::FloatWrapper u;

  u = 2.0 + u;

  return 0;
}
```

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