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-rw-r--r--enumerator.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/enumerator.c b/enumerator.c
index 62dbf57..71f473a 100644
--- a/enumerator.c
+++ b/enumerator.c
@@ -1663,6 +1663,12 @@ lazy_zip(int argc, VALUE *argv, VALUE obj)
for (i = 0; i < argc; i++) {
v = rb_check_array_type(argv[i]);
if (NIL_P(v)) {
+ for (; i < argc; i++) {
+ if (!rb_respond_to(argv[i], id_each)) {
+ rb_raise(rb_eTypeError, "wrong argument type %s (must respond to :each)",
+ rb_obj_classname(argv[i]));
+ }
+ }
ary = rb_ary_new4(argc, argv);
func = lazy_zip_func;
break;