[Committed] PR fortran/87922 -- Additional checks for ASYNCHRONOUS

[Steve Kargl]

I've committed the attached patch to trunk and branch-8.
ChangeLogs on trunk record wrong PR number.  I fix those
someday.

2018-12-10  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/87922
	* io.c (gfc_match_open): Additional checks on ASYNCHRONOUS.

2018-12-10  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/87922
	* gfortran.dg/io_constraints_8.f90: Update error message.
	* gfortran.dg/pr87922.f90: New test.

-- 
Steve
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