d9e462fd97
Run stable `fmt` & `cargo` through `rustup`
`cargo test -p ide-assists` fails on Windows/x64/nightly:
```shell
> rustup self update
info: checking for self-updates
rustup unchanged - 1.25.1
> rustup update
info: syncing channel updates for 'stable-x86_64-pc-windows-msvc'
info: syncing channel updates for 'nightly-x86_64-pc-windows-msvc'
info: checking for self-updates
stable-x86_64-pc-windows-msvc unchanged - rustc 1.62.1 (e092d0b6b 2022-07-16)
nightly-x86_64-pc-windows-msvc unchanged - rustc 1.64.0-nightly (affe0d3a0 2022-08-05)
info: cleaning up downloads & tmp directories
> rustup show
Default host: x86_64-pc-windows-msvc
rustup home: C:\Users\stanc\.rustup
installed toolchains
--------------------
stable-x86_64-pc-windows-msvc
nightly-x86_64-pc-windows-msvc (default)
active toolchain
----------------
nightly-x86_64-pc-windows-msvc (default)
rustc 1.64.0-nightly (affe0d3a0 2022-08-05)
> cargo test -p ide-assists
test tests::sourcegen::sourcegen_assists_docs ... FAILED
failures:
---- tests::sourcegen::sourcegen_assists_docs stdout ----
thread 'tests::sourcegen::sourcegen_assists_docs' panicked at 'Failed to run rustfmt from toolchain 'stable'. Please run `rustup component add rustfmt --toolchain stable` to install it.', crates\sourcegen\src\lib.rs:141:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
failures:
tests::sourcegen::sourcegen_assists_docs
test result: FAILED. 1576 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 1.82s
error: test failed, to rerun pass '-p ide-assists --lib'
```
After some investigation it seemed that [`cmd!`](51705698bd/crates/sourcegen/src/lib.rs (L139)) didn't execute the expected (stable) rustfmt.
A simple `xshell` test failed too:
```rust
use xshell::{cmd, Shell};
fn main() {
let sh = &Shell::new().unwrap();
sh.set_var("RUSTUP_TOOLCHAIN", "stable");
let version = cmd!(sh, "rustfmt --version").read().unwrap_or_default();
println!("{version}");
}
```
Bypassing `xshell` and using `Command` directly failed too:
```rust
use std::process::{Command, Stdio};
fn main() {
let child = Command::new("rustfmt")
.arg("--version")
.stdin(Stdio::null())
.stdout(Stdio::piped())
.env("RUSTUP_TOOLCHAIN", "stable")
.spawn()
.expect("failed to start");
let output = child.wait_with_output().unwrap();
let version = String::from_utf8_lossy(&output.stdout);
println!("{version}");
}
```
Spawning `cargo +stable fmt version` [failed too](https://github.com/rust-lang/rustup/issues/3036) with `error: no such subcommand: +stable`.
Only `rustup run stable` worked fine for both `cargo` and `fmt`.
Thanks to `@lnicola` for a live investigation session, hints and tips.
rust-analyzer is a modular compiler frontend for the Rust language. It is a part of a larger rls-2.0 effort to create excellent IDE support for Rust.
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