/*
 *   call-seq:
 *      breakpoint.expr = string
 *
 *   Sets the codition expression when this breakpoint should be activated.
 */
static VALUE
breakpoint_set_expr(VALUE self, VALUE value)
{
    debug_breakpoint_t *breakpoint;

    Data_Get_Struct(self, debug_breakpoint_t, breakpoint);
    breakpoint->expr = StringValue(value);
    return value;
}