1 files changed, 21 insertions, 0 deletions
diff --git a/gcc/testsuite/gfortran.dg/do_check_4.f90 b/gcc/testsuite/gfortran.dg/do_check_4.f90
new file mode 100644
index 000000000..65bc92c7e
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/do_check_4.f90
@@ -0,0 +1,21 @@
+! { dg-do run }
+! { dg-options "-fcheck=do" }
+! { dg-shouldfail "DO check" }
+!
+! PR fortran/34656
+! Run-time check for modifing loop variables
+!
+PROGRAM test
+  IMPLICIT NONE
+  INTEGER :: i
+  DO i=1,100
+    CALL do_something()
+  ENDDO
+CONTAINS
+ SUBROUTINE do_something()
+ IMPLICIT NONE
+   DO i=1,10
+   ENDDO
+ END SUBROUTINE do_something
+END PROGRAM test
+! { dg-output "Fortran runtime error: Loop variable has been modified" }