push_insn
ret = push_insn(t, t + insn_sz, FALLTHROUGH, env);
ret = push_insn(t, w, BRANCH, env);
return push_insn(t, t + insn_sz, FALLTHROUGH, env);
ret = push_insn(t, t + off + 1, FALLTHROUGH, env);
ret = push_insn(t, t + 1, FALLTHROUGH, env);
return push_insn(t, t + insn->off + 1, BRANCH, env);