[llvm-bugs] [Bug 31078] unexpected "use of overloaded operator '==' is ambiguous"

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31078

Richard Smith <richard-llvm at metafoo.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |richard-llvm at metafoo.co.uk
         Resolution|---                         |INVALID

--- Comment #1 from Richard Smith <richard-llvm at metafoo.co.uk> ---
Per P0136R1, there is an implicit conversion from B to A -- you can construct a
Master from a B, so you can construct an A from a B.

GCC trunk also implements P0136R1, and also rejects this due to the ambiguity.

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