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rustdoc: create rustc command with an iterator

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This avoids unnecessary allocation with a temporary Vec.
This commit is contained in:
Travis Finkenauer 2023-08-20 20:25:30 -07:00
parent 3d53242e53
commit 713043ef22
1 changed files with 6 additions and 4 deletions
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10
src/librustdoc/doctest.rs
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@ -307,12 +307,14 @@ fn add_exe_suffix(input: String, target: &TargetTriple) -> String {
} }
fn wrapped_rustc_command(rustc_wrappers: &[PathBuf], rustc_binary: &Path) -> Command { fn wrapped_rustc_command(rustc_wrappers: &[PathBuf], rustc_binary: &Path) -> Command {
let args: Vec<&Path> = let mut args = rustc_wrappers.iter().map(PathBuf::as_path).chain([rustc_binary].into_iter());
rustc_wrappers.iter().map(PathBuf::as_path).chain([rustc_binary].into_iter()).collect();
let (exe, args) = args.split_first().expect("unable to create rustc command");
let exe = args.next().expect("unable to create rustc command");
let mut command = Command::new(exe); let mut command = Command::new(exe);
command.args(args); for arg in args {
command.arg(arg);
}
command command
} }