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-rw-r--r--modules/language/python/list.scm2
1 files changed, 1 insertions, 1 deletions
diff --git a/modules/language/python/list.scm b/modules/language/python/list.scm
index b101da7..782b5a9 100644
--- a/modules/language/python/list.scm
+++ b/modules/language/python/list.scm
@@ -753,7 +753,7 @@
(define-method (len x)
(if (null? x)
0
- (error "not a suitable lengthof")))
+ (error "not a suitable lengthof" x)))
(define-method (len (v <vector>)) (vector-length v))
(define-method (len (s <string>)) (string-length s))
(define-method (len (o <py-list>)) (slot-ref o 'n))