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-rw-r--r--libguile/vm-engine.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/libguile/vm-engine.c b/libguile/vm-engine.c
index 3956a389d..84af98c07 100644
--- a/libguile/vm-engine.c
+++ b/libguile/vm-engine.c
@@ -180,6 +180,12 @@ vm_run (SCM vm, SCM program, SCM args)
err_msg = scm_from_locale_string ("VM: Attempt to unroll an improper list: tail is ~A");
goto vm_error;
+ vm_error_not_a_pair:
+ SYNC_ALL ();
+ scm_wrong_type_arg_msg (FUNC_NAME, 1, err_args, "pair");
+ /* shouldn't get here */
+ goto vm_error;
+
vm_error_no_values:
err_msg = scm_from_locale_string ("VM: 0-valued return");
err_args = SCM_EOL;