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Moar linting: needless_borrow, let_unit_value, ...

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* There are a few needless borrows that don't seem to be needed. I even did a quick assembly comparison and posted a q to stackoveflow on it. See [here](https://stackoverflow.com/questions/74910196/advantages-of-pass-by-ref-val-with-impl-intoiteratoritem-impl-asrefstr)
* removed several `let _ = ...` when they don't look necessary (even a few ones that were not suggested by clippy (?))
* there were a few `then(|| ctor{})` that clippy suggested to replace with `then_some(ctor{})` -- seems reasonable?
* some unneeded assignment+return - keep the code a bit leaner
* a few `writeln!` instead of `write!`, or even consolidate write!
* a nice optimization to use `ch.is_ascii_digit` instead of `ch.is_digit(10)`
This commit is contained in:
Yuri Astrakhan 2022-12-24 16:09:08 -05:00
parent 2872e05589
commit d3dbf9c194
15 changed files with 22 additions and 26 deletions
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2
crates/toolchain/src/lib.rs
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@ -35,7 +35,7 @@ fn get_path_for_executable(executable_name: &'static str) -> PathBuf {
// example: for cargo, this tries ~/.cargo/bin/cargo
// It seems that this is a reasonable place to try for cargo, rustc, and rustup
let env_var = executable_name.to_ascii_uppercase();
if let Some(path) = env::var_os(&env_var) {
if let Some(path) = env::var_os(env_var) {
return path.into();
}