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Support multiple targets for checkOnSave (in conjunction with cargo 1.64.0+) This PR adds support for the ability to pass multiple `--target` flags when using `cargo` 1.64.0+. ## Questions I needed to change the type of two configurations options, but I did not plurialize the names to avoid too much churn, should I ? ## Zulip thread https://rust-lang.zulipchat.com/#narrow/stream/185405-t-compiler.2Frust-analyzer/topic/Issue.2013282.20.28supporting.20multiple.20targets.20with.201.2E64.2B.29 ## Example To see it working, on a macOS machine: ```sh $ cd /tmp $ cargo new cargo-multiple-targets-support-ra-test $ cd !$ $ mkdir .cargo $ echo ' [build] target = [ "aarch64-apple-darwin", "x86_64-apple-darwin", ] ' > .cargo/config.toml $ echo ' fn main() { #[cfg(all(target_arch = "aarch64", target_os = "macos"))] { let a = std::fs::read_to_string("/tmp/test-read"); } #[cfg(all(target_arch = "x86_64", target_os = "macos"))] { let a = std::fs::read_to_string("/tmp/test-read"); } #[cfg(all(target_arch = "x86_64", target_os = "windows"))] { let a = std::fs::read_to_string("/tmp/test-read"); } } ' > src/main.rs # launch your favorite editor with the version of RA from this PR # # You should see warnings under the first two `let a = ...` but not the third ``` ## Screen  Helps with #13282 |
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