Method set_explain

src/script.rs:82–88

(&mut self, explain: &str)

            explain = &explain[0..18];
        }
        self.explain = format!("{}{}", explain, "...");
    }

    pub(crate) fn set_index(&mut self, index: usize) {
        self.current_block = index;
    }

    pub(crate) fn set_offset(&mut self, offset: i32) {
        let new_offset = (self.backlog_offset as i32 + offset).max(0);
        // 不能超过最大可偏移量