[Patch, fortran] PR20880 - Failure to detect procedures encompassing own interface

[Paul Thomas]

:ADDPATCH fortran:

This PR is asssociated with the failure of gfortran to recognise 
interfaces that have the same name as their enclosing scope; either 
directly or by use association.  The former causes an ICE at present, 
whilst the latter is quietly accepted.

The patch and the testcase are straightforward: USE associated 
procedures are already marked as ambiguous in module.c; Directly 
enclosed interfaces are checked in gfc_add_explicit_interface.  Note 
that SUCCESS is returned here to prevent the plethora of secondary 
errors.  The preceeding error is not amenable to this, as it promptly 
gets over-ridden by errors concerning type and kind confusion.

Regtested on suse10.1/amd64  - OK for trunk, 4.2 and 4.1?

Paul

2006-11-21 Paul Thomas  <pault@gcc.gnu.org>

    PR fortran/20880
    * symbol.c (gfc_add_explicit_interface): Error if procedure is that 
of encompassing scope.
    * resolve.c (resolve_fl_procedure): Error if procedure is ambiguous.

2006-11-21 Paul Thomas  <pault@gcc.gnu.org>

    PR fortran/20880
    * gfortran.dg/interface_3.f90: New test.

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