Fortran: improve error recovery while simplifying size of bad array [PR103694]

gcc/fortran/ChangeLog:

	PR fortran/103694
	* simplify.cc (simplify_size): The size expression of an array cannot
	be simplified if an error occurs while resolving the array spec.

gcc/testsuite/ChangeLog:

	PR fortran/103694
	* gfortran.dg/pr103694.f90: New test.

Author: harald-anlauf

gcc/fortran/simplify.cc

@@ -7536,8 +7536,9 @@ simplify_size (gfc_expr *array, gfc_expr *dim, int k)
     }
 
   for (ref = array->ref; ref; ref = ref->next)
-    if (ref->type == REF_ARRAY && ref->u.ar.as)
-      gfc_resolve_array_spec (ref->u.ar.as, 0);
+    if (ref->type == REF_ARRAY && ref->u.ar.as
+	&& !gfc_resolve_array_spec (ref->u.ar.as, 0))
+      return NULL;
 
   if (dim == NULL)
     {

gcc/testsuite/gfortran.dg/pr103694.f90

@@ -0,0 +1,11 @@
+! { dg-do compile }
+! PR fortran/103694 - ICE in gfc_conv_expr_op
+! Contributed by G.Steinmetz
+
+subroutine s
+  type t
+     integer :: a(2)
+  end type
+  type(t) :: x((0.)/0)
+  integer :: n = size(x(1)%a) ! { dg-error "does not reduce to a constant expression" }
+end