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-rw-r--r--vm_insnhelper.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 74e992a500..2fa96373b6 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -4068,7 +4068,7 @@ vm_define_class(ID id, rb_num_t flags, VALUE cbase, VALUE super)
if (VM_DEFINECLASS_HAS_SUPERCLASS_P(flags) && !RB_TYPE_P(super, T_CLASS)) {
rb_raise(rb_eTypeError,
- "superclass must be a Class (%"PRIsVALUE" given)",
+ "superclass must be an instance of Class (given an instance of %"PRIsVALUE")",
rb_obj_class(super));
}