Fortran: F2018 GENERIC statement is missing [PR121182]

Fortran: F2018 GENERIC statement is missing [PR121182]

2025-08-09  Paul Thomas  <pault@gcc.gnu.org>

gcc/fortran
	PR fortran/121182
	* decl.cc (match_generic_stmt): New function based on original
	gfc_match_generic but feeding namespace rather than typebound
	generics.
	(match_typebound_generic): Renamed original gfc_match_generic.
	(gfc_match_generic): New function that selects between type
	bound generic and other generic statements and calls one of the
	above two functions as appropriate.
	* parse.cc (decode_specification_statement): Allow generic
	statements.
	(parse_spec): Accept a generic statement in a specification
	block.

gcc/testsuite/
	PR fortran/121182
	* gfortran.dg/generic_stmt_1.f90: New test.
	* gfortran.dg/generic_stmt_2.f90: New test.
	* gfortran.dg/generic_stmt_3.f90: New test.
	* gfortran.dg/generic_stmt_4.f90: New test.