这是我抄的代码:

// Tested against syntex_syntax v0.33
extern crate syntex_syntax as syntax;

use std::rc::Rc;
use syntax::codemap::{CodeMap};
use syntax::errors::{Handler};
use syntax::errors::emitter::{ColorConfig};
use syntax::parse::{self, ParseSess};

fn main() {
    let codemap = Rc::new(CodeMap::new());
    let tty_handler =
        Handler::with_tty_emitter(ColorConfig::Auto, None, true, false, codemap.clone());
    let parse_session = ParseSess::with_span_handler(tty_handler, codemap.clone());

    let src = "fn foo(x: i64) { let y = x + 1; return y; }".to_owned();

    let result = parse::parse_crate_from_source_str(String::new(), src, Vec::new(), &parse_session);
    println!("parse result: {:?}", result);
}

首先,要建立一个

[package]
name = "aa"
authors = ["me"]
version = "0.1.0"

[dependencies]
syntex_syntax = "0.59.1"

少一个字段就不行,rust说必须给我加上.
然后cargo build我叉,又是66个包.编译非常之久.
我一运行,我叉,运行出错了.,然后我把这个包删掉,我叉,占用了我300M,这都是一堆垃圾.为什么占用我这么多的空间.
总之,rust不是我喜欢的类型,简直是搞笑的语言.