Replace panics with errors in thread spawning #12040
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Also adds `IntoSpanned` trait for easily constructing `Spanned`, and an implementation of `From<Spanned<std::io::Error>>` for `ShellError`, which is used to provide context for the error wherever there was a span conveniently available. In general this should make it more convenient to do the right thing with `std::io::Error` and always add a span to it when it's possible to do so.
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Description
Replace panics with errors in thread spawning.
Also adds
IntoSpannedtrait for easily constructingSpanned, and an implementation ofFrom<Spanned<std::io::Error>>forShellError, which is used to provide context for the error wherever there was a span conveniently available. In general this should make it more convenient to do the right thing withstd::io::Errorand always add a span to it when it's possible to do so.User-Facing Changes
Fewer panics!
Tests + Formatting
toolkit fmttoolkit clippytoolkit testtoolkit test stdlib