eval.c:7615
static VALUE
method_proc(method)
    VALUE method;
{
    VALUE proc;
    struct METHOD *mdata;
    struct BLOCK *bdata;

    proc = rb_iterate((VALUE(*)_((VALUE)))mproc, 0, bmcall, method);
    Data_Get_Struct(method, struct METHOD, mdata);
    Data_Get_Struct(proc, struct BLOCK, bdata);
    bdata->body->nd_file = mdata->body->nd_file;
    nd_set_line(bdata->body, nd_line(mdata->body));
    bdata->body->nd_state = YIELD_FUNC_SVALUE;

    return proc;
}
