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-rw-r--r--libguile/procs.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libguile/procs.c b/libguile/procs.c
index dc4375554..898a3710b 100644
--- a/libguile/procs.c
+++ b/libguile/procs.c
@@ -134,7 +134,7 @@ SCM_DEFINE (scm_thunk_p, "thunk?", 1, 0, 0,
switch (SCM_TYP7 (obj))
{
case scm_tcs_closures:
- return scm_from_bool (!scm_is_pair (SCM_CLOSURE_FORMALS (obj)));
+ return scm_from_bool (SCM_CLOSURE_NUM_REQUIRED_ARGS (obj) == 0);
case scm_tc7_subr_0:
case scm_tc7_subr_1o:
case scm_tc7_lsubr: