[RFC] Patch to fix Infinite Stack Recursion Regression

[Geoffrey Keating]

Hi Fariborz,

> * cp-tree.h (can_convert_arg, fn_type_unification): New argument.
> * call.c (add_template_candidate_real): Pass down 'flags' to
> fn_type_unification.
> (can_convert_arg): New 'flags' argument. Pass it to call to
> implicit_conversion instead of LOOKUP_NORMAL.
> * class.c (resolve_address_of_overloaded_function): Add
> LOOKUP_NORMAL in call to can_convert_arg.
> (resolve_address_of_overloaded_function): Ditto.
> * decl.c (reshape_init, check_default_argument): Ditto.
> * typeck.c (build_ptrmemfunc): Ditto.
> * typeck2.c (digest_init): Ditto.
> (unify): Add LOOKUP_NORMAL to call to type_unification_real.
> * pt.c (type_unification_real): Add 'flags' argument.
> (fn_type_unification): Pass 'flags' to type_unification_real.
> (type_unification_real): Pass new 'flags' argument to call to
> can_convert_arg.

This looks reasonable, could you make a version of that patch that  
applies to FSF and post that for review?

:REVIEWMAIL:
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