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fix(cli): make debugging in windows work
On windows, if `stderr` or `stdin` aren't also set to `Stdio::null()` the `spawn()` fails with `The handle is invalid`, and `rustlings` thinks that there's no `rustc` installed.
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@ -396,6 +396,8 @@ fn rustc_exists() -> bool {
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Command::new("rustc")
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.args(["--version"])
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.stdout(Stdio::null())
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.stderr(Stdio::null())
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.stdin(Stdio::null())
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.spawn()
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.and_then(|mut child| child.wait())
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.map(|status| status.success())
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