[PATCH,committed] PR fortran/51993 -- Convert assert() to if-statement

[Steve Kargl]

I've committed the attached patch as obvious.  It
converts a gcc_assert() into an if-statement, which
then allows gfortran to issue a sensible error
message.

2015-10-15  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/51993
	* decl.c (gfc_set_constant_character_len): Convert gcc_assert into an
	if-statement causing an early return leads to valid error message.

2015-10-15  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/51993
	* gfortran.dg/pr51993.f90: New test.

-- 
Steve
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