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It looks like many of these tests are already disabled on emscripten,
which also doesn't seem to support environment variables and subprocess
spawning. Just add a similar tag for CloudABI. While there, sort some of
the lists of operating systems alphabetically.
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All tests should now have annotation for *why* they're ignored on emscripten. A
few tests no longer need such an annotation as well!
Closes #41299
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Most of these rely on spawning processes, which is not possible in
Emscripten.
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This commit implements the `exec` function proposed in [RFC 1359][rfc] which is
a function on the `CommandExt` trait to execute all parts of a `Command::spawn`
without the `fork` on Unix. More details on the function itself can be found in
the comments in the commit.
[rfc]: https://github.com/rust-lang/rfcs/pull/1359
cc #31398
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