I can't seem to get the example code from the File documentation to work. I added the main function, etc:
use std::io::prelude::*;
use std::fs::File;
fn main(){
let mut f = try!(File::create("foo.txt"));
try!(f.write_all(b"Hello, world!"));
let mut f = try!(File::open("foo.txt"));
let mut s = String::new();
try!(f.read_to_string(&mut s));
assert_eq!(s, "Hello, world!");
}
Gives me these errors:
file git:(master) ✗ rustc main.rs -o /tmp/rrust.out
<std macros>:5:8: 6:42 error: mismatched types:
expected `()`,
found `core::result::Result<_, _>`
(expected (),
found enum `core::result::Result`) [E0308]
<std macros>:5 return $ crate:: result:: Result:: Err (
<std macros>:6 $ crate:: convert:: From:: from ( err ) ) } } )
main.rs:5:17: 5:46 note: in this expansion of try! (defined in <std macros>)
<std macros>:5:8: 6:42 help: run `rustc --explain E0308` to see a detailed explanation
<std macros>:5:8: 6:42 error: mismatched types:
expected `()`,
found `core::result::Result<_, _>`
(expected (),
found enum `core::result::Result`) [E0308]
<std macros>:5 return $ crate:: result:: Result:: Err (
<std macros>:6 $ crate:: convert:: From:: from ( err ) ) } } )
main.rs:6:5: 6:41 note: in this expansion of try! (defined in <std macros>)
<std macros>:5:8: 6:42 help: run `rustc --explain E0308` to see a detailed explanation
<std macros>:5:8: 6:42 error: mismatched types:
expected `()`,
found `core::result::Result<_, _>`
(expected (),
found enum `core::result::Result`) [E0308]
<std macros>:5 return $ crate:: result:: Result:: Err (
<std macros>:6 $ crate:: convert:: From:: from ( err ) ) } } )
main.rs:8:17: 8:44 note: in this expansion of try! (defined in <std macros>)
<std macros>:5:8: 6:42 help: run `rustc --explain E0308` to see a detailed explanation
<std macros>:5:8: 6:42 error: mismatched types:
expected `()`,
found `core::result::Result<_, _>`
(expected (),
found enum `core::result::Result`) [E0308]
<std macros>:5 return $ crate:: result:: Result:: Err (
<std macros>:6 $ crate:: convert:: From:: from ( err ) ) } } )
main.rs:10:5: 10:36 note: in this expansion of try! (defined in <std macros>)
<std macros>:5:8: 6:42 help: run `rustc --explain E0308` to see a detailed explanation
error: aborting due to 4 previous errors
It looks to me like it really doesn't like those try! statements. I am using Rust 1.5.0.
