[gcc r13-2690] Fortran: error recovery for bad deferred character length assignment [PR104314]

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

https://gcc.gnu.org/g:7bd4deb2a7c1394550610ab27507d1ed2af817c2

commit r13-2690-g7bd4deb2a7c1394550610ab27507d1ed2af817c2
Author: Harald Anlauf <anlauf@gmx.de>
Date:   Thu Sep 15 22:06:53 2022 +0200

    Fortran: error recovery for bad deferred character length assignment [PR104314]
    
    gcc/fortran/ChangeLog:
    
            PR fortran/104314
            * resolve.cc (deferred_op_assign): Do not try to generate temporary
            for deferred character length assignment if types do not agree.
    
    gcc/testsuite/ChangeLog:
    
            PR fortran/104314
            * gfortran.dg/pr104314.f90: New test.
    
    Co-authored-by: Steven G. Kargl <kargl@gcc.gnu.org>

Diff:
---
 gcc/fortran/resolve.cc                 | 1 +
 gcc/testsuite/gfortran.dg/pr104314.f90 | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/gcc/fortran/resolve.cc b/gcc/fortran/resolve.cc
index ca114750f65..ae7ebb624e4 100644
--- a/gcc/fortran/resolve.cc
+++ b/gcc/fortran/resolve.cc
@@ -11803,6 +11803,7 @@ deferred_op_assign (gfc_code **code, gfc_namespace *ns)
 
   if (!((*code)->expr1->ts.type == BT_CHARACTER
 	 && (*code)->expr1->ts.deferred && (*code)->expr1->rank
+	 && (*code)->expr2->ts.type == BT_CHARACTER
 	 && (*code)->expr2->expr_type == EXPR_OP))
     return false;
 
diff --git a/gcc/testsuite/gfortran.dg/pr104314.f90 b/gcc/testsuite/gfortran.dg/pr104314.f90
new file mode 100644
index 00000000000..510ded0b164
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr104314.f90
@@ -0,0 +1,9 @@
+! { dg-do compile }
+! PR fortran/104314 - ICE in deferred_op_assign
+! Contributed by G.Steinmetz
+
+program p
+  character(:), allocatable :: c(:)
+  c = ['123']
+  c = c == c  ! { dg-error "Cannot convert" }
+end