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Ensure Send/Sync impl for std::process::CommandArgs#155113

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Mark-Simulacrum wants to merge 1 commit intorust-lang:mainfrom
Mark-Simulacrum:auto-trait-cmd
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Ensure Send/Sync impl for std::process::CommandArgs#155113
Mark-Simulacrum wants to merge 1 commit intorust-lang:mainfrom
Mark-Simulacrum:auto-trait-cmd

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This also adds static assertions to ensure this continues to hold across all targets. I think today this was just missing on cfg(unix) targets, but haven't checked too thoroughly. I think all tier 2+ targets continue to compile with the assertions (but we'll see what CI says).

cc #154517

@Mark-Simulacrum Mark-Simulacrum added T-libs-api Relevant to the library API team, which will review and decide on the PR/issue. needs-fcp This change is insta-stable, or significant enough to need a team FCP to proceed. labels Apr 10, 2026
@rustbot rustbot added the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Apr 10, 2026
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needs-fcp This change is insta-stable, or significant enough to need a team FCP to proceed. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.

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