[C++] deprecate overload resolution extension?

[Nathan Sidwell]

Hi,
we currently have an overload resolution extension, which is disabled
by pedantic. I think the extension is `safe' in that it makes otherwise
illformed programs compile, but it is unsafe in that it can confuse the
poor user. Here's the code from call.c
tweak:
     
  /* Extension: If the worst conversion for one candidate is worse than the
     worst conversion for the other, take the first.  */
  if (!pedantic)
	{...

should we deprecate this one too? bug 643 is probably a result of
this extension.

nathan
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