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Illustrating rust-lang/rust#46711

rust-46711
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943d5ac763
2개의 변경된 파일17개의 추가작업 그리고 26개의 파일을 삭제
  1. +9
    -17
      cargo.out
  2. +8
    -9
      src/main.rs

+ 9
- 17
cargo.out 파일 보기

@@ -1,24 +1,16 @@
Compiling futuretest v0.1.0 (file:///mnt/c/Users/Mahmoud/git/futuretest)
error[E0271]: type mismatch resolving `<futures::FutureResult<(), std::string::String> as futures::IntoFuture>::Error == &str`
--> src/main.rs:13:10
error[E0277]: the trait bound `(): futures::Future` is not satisfied
--> src/main.rs:17:1
|
13 | .and_then(|_|
| ^^^^^^^^ expected struct `std::string::String`, found &str
17 | / fn test() -> MapErr<(), ()> {
18 | | future::ok(())
19 | | .map_err(|String| ())
20 | | }
| |_^ the trait `futures::Future` is not implemented for `()`
|
= note: expected type `std::string::String`
found type `&str`
= note: required by `futures::MapErr`

error[E0271]: type mismatch resolving `<futures::FutureResult<(), std::string::String> as futures::IntoFuture>::Error == &str`
--> src/main.rs:20:10
|
20 | core.run(f).unwrap();
| ^^^ expected struct `std::string::String`, found &str
|
= note: expected type `std::string::String`
found type `&str`
= note: required because of the requirements on the impl of `futures::Future` for `futures::AndThen<futures::Map<futures::MapErr<futures::FutureResult<(), ()>, [closure@src/main.rs:11:18: 11:43]>, [closure@src/main.rs:12:14: 12:67]>, futures::FutureResult<(), std::string::String>, [closure@src/main.rs:13:19: 16:14]>`

error: aborting due to 2 previous errors
error: aborting due to previous error

error: Could not compile `futuretest`.



+ 8
- 9
src/main.rs 파일 보기

@@ -1,3 +1,5 @@
#![feature(conservative_impl_trait)]

extern crate futures;
extern crate tokio_core;
use futures::future::{self};
@@ -7,15 +9,12 @@ use tokio_core::reactor::Core;
fn main() {
let mut core = Core::new().expect("Failed to initialize tokio_core reactor!");

let f = future::result(Ok(()))
.map_err(|()| "&'static str error")
.map(|_| future::result(Err("another &'static str error")))
.and_then(|_|
future::result(Ok(())
.map_err(|()| "String error".to_owned())
)
)
;
let f = test();

core.run(f).unwrap();
}

fn test() -> MapErr<(), ()> {
future::ok(())
.map_err(|String| ())
}

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