This might be a duplicate of #39959. I'm posting a new issue here as the mechanism that the error is triggered significantly differs from that in the aforementioned issue.
Sample code
[package]
name = "example"
version = "0.1.0"
authors = ["Author"]
edition = "2018"
[dependencies]
tokio = "=0.1.14"
use std::fs::File;
use std::io::{Read, Write};
use std::path::Path;
// Comment this out... and everything will work fine
use thisdoesntexistyolo::haha;
struct Something<T: Read + Write> {
thing: T,
}
impl<'a, T: 'a + Read + Write> Something<T>
where
&'a T: Read,
{
fn new(thing: T) -> Something<T> {
Something { thing }
}
}
fn main() {
let file = File::open(Path::new("doesntmatter.txt")).unwrap();
let mut st: Something<File> = Something::new(file);
}(Playground)
error[E0432]: unresolved import `thisdoesntexistyolo`
--> src/main.rs:6:5
|
6 | use thisdoesntexistyolo::haha;
| ^^^^^^^^^^^^^^^^^^^ use of undeclared type or module `thisdoesntexistyolo`
warning: unused import: `thisdoesntexistyolo::haha`
--> src/main.rs:6:5
|
6 | use thisdoesntexistyolo::haha;
| ^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: #[warn(unused_imports)] on by default
error[E0275]: overflow evaluating the requirement `_: std::marker::Sized`
--> src/main.rs:23:35
|
23 | let mut st: Something<File> = Something::new(file);
| ^^^^^^^^^^^^^^
|
= help: consider adding a `#![recursion_limit="128"]` attribute to your crate
= note: required because of the requirements on the impl of `std::io::Read` for `&tokio_reactor::poll_evented::PollEvented<_>`
= note: required because of the requirements on the impl of `std::io::Read` for `&tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<_>>`
= note: required because of the requirements on the impl of `std::io::Read` for `&tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<_>>>`
= note: required because of the requirements on the impl of `std::io::Read` for `&tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<_>>>>`
[...]
= note: required because of the requirements on the impl of `std::io::Read` for `&tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<tokio_reactor::poll_evented::PollEvented<_>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>`
Details
- This issue will still occur if the imported package is real.
- When
use thisdoesntexistyolo::haha; is replaced with anything more than 2 levels deep like use thisdoesntexistyolo::a::b;, the code will compile without the error.
This might be a duplicate of #39959. I'm posting a new issue here as the mechanism that the error is triggered significantly differs from that in the aforementioned issue.
Sample code
(Playground)
Details
use thisdoesntexistyolo::haha;is replaced with anything more than 2 levels deep likeuse thisdoesntexistyolo::a::b;, the code will compile without the error.