[PATCH] PR fortran/90166 -- Add check for module prefix

[Steve Kargl]

The attach patch adds a check that a module prefix 
occurs only in a module, submodule, or interface.

C1547 (R1526) MODULE shall appear only in the function-stmt or
   subroutine-stmt of a module subprogram or of a nonabstract
   interface body that is declared in the scoping unit of a
   module or submodule.

The patch has been bootstrapped and regression
tested on x86_64-*-freebsd.  OK to commit?

2019-04-19  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/90166
	* decl.c (in_module_or_interface): New function to check that the
	current state is in a module, submodule, or interface.
	(gfc_match_prefix): Use it.

	PR fortran/90166
	* gfortran.dg/submodule_22.f08: Add additional dg-error comments.

-- 
Steve
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