use statements in blocks are not used to inform autocompletion or type inference

[zrneely]

I noticed that use statements that occur inside blocks are not being used to inform autocompletion or type inference. For example, this doesn't give completions or display types on file. or File:::

fn main() {
    let result = {
        use std::{fs::File, io::Read};

        let mut file = File::open("test.txt").unwrap();
        let mut buf = [0; 16];
        file.read_exact(&mut buf[..]).unwrap();
        buf
    };
}

Whereas this does:

use std::{fs::File, io::Read};

fn main() {
    let result = {
        let mut file = File::open("test.txt").unwrap();
        let mut buf = [0; 16];
        file.read_exact(&mut buf[..]).unwrap();
        buf
    };
}

I noticed this while using the rust-analyzer plugin for VS Code, version 0.2.232. Apologies if this is a duplicate issue or isn't sufficiently descriptive. I'm a happy user of rust-analyzer, but I don't have much knowledge about commonly used terminology so I may have missed something while searching the issue tracker.

[flodiebold]

Duplicate of #1165.