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-rw-r--r--libguile/vm-i-system.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/libguile/vm-i-system.c b/libguile/vm-i-system.c
index e1aedd7cd..5b40c1b9d 100644
--- a/libguile/vm-i-system.c
+++ b/libguile/vm-i-system.c
@@ -1612,7 +1612,15 @@ VM_DEFINE_INSTRUCTION (91, fluid_ref, "fluid-ref", 0, 1, 1)
*sp = scm_fluid_ref (*sp);
}
else
- *sp = SCM_SIMPLE_VECTOR_REF (fluids, num);
+ {
+ SCM val = SCM_SIMPLE_VECTOR_REF (fluids, num);
+ if (SCM_UNLIKELY (val == SCM_UNDEFINED))
+ {
+ finish_args = *sp;
+ goto vm_error_unbound_fluid;
+ }
+ *sp = val;
+ }
NEXT;
}