Wrong blkargs pos for vararg; ref
MODIFY
src/vm.c
src/vm.c
@@ -289,7 +289,7 @@ mrb_env_unshare(mrb_state *mrb, struct REnv *e)
if (!e->c) {
/* save block argument position (negated) */
e->cioff = -e->cxt.c->cibase[cioff].argc-1;
- if (e->cioff == 0) e->cioff = -1;
+ if (e->cioff == 0) e->cioff = -2; /* blkarg position for vararg (1:args, 2:blk) */
}
e->cxt.mid = e->cxt.c->cibase[cioff].mid;
p = (mrb_value *)mrb_malloc(mrb, sizeof(mrb_value)*len);

Wrong blkargs pos for vararg; ref #3768