The attached patch fixes an ICE by reporting an error
for the re-declaration of a subroutine by trying to 
include itself as an internal subprogram.

Regression tested on x86_64-*-freebsd and i568-*-freebsd.
OK to commit?

2018-03-17  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/77414
	* decl.c (get_proc_name):  Check for a subroutine re-defined in
	the contain portion of a subroutine.  Change language of existing
	error message to better describe the issue. While here fix whitespace
	issues.

2018-03-17  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/77414
	* gfortran.dg/pr77414.f90: New test.
	* gfortran.dg/internal_references_1.f90: Adjust error message.

-- 
Steve