[PATCH] Fortran : ICE in gfc_validate_kind PR95586

[Mark Eggleston]

Please find attached fix for PR95586.

OK to commit and backport?

Proposed commit message:

Fortran  :  ICE in gfc_validate_kind PR95586

Report syntax error for invalid letter-spec in IMPLICIT statements
for derived types and not an ICE.

Original patch by Steve Kargl.  Added test cases based on those
provided by G. Steinmetz  in the PR.

2020-06-17  Steven G. Kargl  <kargl@gcc.gnu.org>

gcc/fortran/

     PR fortran/95586
     * dec.l (gfc_match_implicit): Only perform else branch if
     the type spect is not BT_DERIVED.

2020-06-17  Mark Eggleston <markeggleston@gcc.gnu.org>

gcc/testsuite/

     PR fortran/95586
     * gfortran.dg/pr95586_1.f90: New test.
     * gfortran.dg/pr95586_2.f90: New test.

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