[gcc r13-1767] Fortran: fix parsing of omp task affinity iterator clause [PR101330]

[Harald Anlauf <anlauf@gcc.gnu.org>]

https://gcc.gnu.org/g:26bbe78f77f73bb66af1ac13d0deec888a3c6510

commit r13-1767-g26bbe78f77f73bb66af1ac13d0deec888a3c6510
Author: Harald Anlauf <anlauf@gmx.de>
Date:   Wed Jul 20 20:40:23 2022 +0200

    Fortran: fix parsing of omp task affinity iterator clause [PR101330]
    
    gcc/fortran/ChangeLog:
    
            PR fortran/101330
            * openmp.cc (gfc_match_iterator): Remove left-over code from
            development that could lead to a crash on invalid input.
    
    gcc/testsuite/ChangeLog:
    
            PR fortran/101330
            * gfortran.dg/gomp/affinity-clause-7.f90: New test.

Diff:
---
 gcc/fortran/openmp.cc                                |  1 -
 gcc/testsuite/gfortran.dg/gomp/affinity-clause-7.f90 | 19 +++++++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/gcc/fortran/openmp.cc b/gcc/fortran/openmp.cc
index bd4ff259fe0..df9cdf43eb7 100644
--- a/gcc/fortran/openmp.cc
+++ b/gcc/fortran/openmp.cc
@@ -1181,7 +1181,6 @@ gfc_match_iterator (gfc_namespace **ns, bool permit_var)
 	}
       if (':' == gfc_peek_ascii_char ())
 	{
-	  step = gfc_get_expr ();
 	  if (gfc_match (": %e ", &step) != MATCH_YES)
 	    {
 	      gfc_free_expr (begin);
diff --git a/gcc/testsuite/gfortran.dg/gomp/affinity-clause-7.f90 b/gcc/testsuite/gfortran.dg/gomp/affinity-clause-7.f90
new file mode 100644
index 00000000000..5b1ca85aba3
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/gomp/affinity-clause-7.f90
@@ -0,0 +1,19 @@
+! { dg-do compile }
+! PR fortran/101330 - ICE in free_expr0(): Bad expr type
+! Contributed by G.Steinmetz
+
+  implicit none
+  integer :: j, b(10)
+!$omp task affinity (iterator(j=1:2:1) : b(j))
+!$omp end task
+!$omp task affinity (iterator(j=1:2:) : b(j)) ! { dg-error "Invalid character" }
+!!$omp end task
+!$omp task affinity (iterator(j=1:2:          ! { dg-error "Invalid character" }
+!!$omp end task
+!$omp task affinity (iterator(j=1:2:)         ! { dg-error "Invalid character" }
+!!$omp end task
+!$omp task affinity (iterator(j=1:2::)        ! { dg-error "Invalid character" }
+!!$omp end task
+!$omp task affinity (iterator(j=1:2:))        ! { dg-error "Invalid character" }
+!!$omp end task
+end