[C++ Patch] PR 22256

[Paolo Carlini]

Hi,

the problem here is that we try to be sophisticated and pedwarn instead
of plain error when the user specifies a return type consistent with the
conversion operator. Unfortunately the idea breaks as soon as pointers
or references are involved, because the type is "approximated" from
declspecs->type. AFAICS, we can simply error unconditionally (as other
front-ends already do) and obtain a consistent behavior.

Tested x86_64-linux, Ok?

Paolo.

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