src/test/run-pass/issue-21400.rs

   1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // Regression test for #21400 which itself was extracted from
  12 // stackoverflow.com/questions/28031155/is-my-borrow-checker-drunk/28031580
  13
  14 #![feature(question_mark)]
  15
  16 fn main() {
  17     let mut t = Test;
  18     assert_eq!(t.method1("one"), Ok(1));
  19     assert_eq!(t.method2("two"), Ok(2));
  20     assert_eq!(t.test(), Ok(2));
  21 }
  22
  23 struct Test;
  24
  25 impl Test {
  26     fn method1(&mut self, _arg: &str) -> Result<usize, &str> {
  27         Ok(1)
  28     }
  29
  30     fn method2(self: &mut Test, _arg: &str) -> Result<usize, &str> {
  31         Ok(2)
  32     }
  33
  34     fn test(self: &mut Test) -> Result<usize, &str> {
  35         let s = format!("abcde");
  36         // (Originally, this invocation of method2 was saying that `s`
  37         // does not live long enough.)
  38         let data = match self.method2(&*s) {
  39             Ok(r) => r,
  40             Err(e) => return Err(e)
  41         };
  42         Ok(data)
  43     }
  44 }
  45
  46 // Below is a closer match for the original test that was failing to compile
  47
  48 pub struct GitConnect;
  49
  50 impl GitConnect {
  51     fn command(self: &mut GitConnect, _s: &str) -> Result<Vec<Vec<u8>>, &str> {
  52         unimplemented!()
  53     }
  54
  55     pub fn git_upload_pack(self: &mut GitConnect) -> Result<String, &str> {
  56         let c = format!("git-upload-pack");
  57
  58         let mut out = String::new();
  59         let data = self.command(&c)?;
  60
  61         for line in data.iter() {
  62             out.push_str(&format!("{:?}", line));
  63         }
  64
  65         Ok(out)
  66     }
  67 }
  68