Misreport of unresolved import

[zonyitoo]

Example code

use std::os::unix::io::{AsRawFd, RawFd};

fn main() {
    println!("Hello, world!");
}

rust-analyzer plugin on vscode reports:

Rust: rustc 1.47.0 (18bf6b4f0 2020-10-07)
OS: x86_64-apple-darwin

rust-analysis is installed by rustup.

[bjorn3]

Duplicate of #6038