Improve error messages for io::fs #14629
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This commit improves the error descriptions and details for the functions and methods exposed in
io::fs
.The basic idea is that the description should always map onto the high-level operation that the user was trying to perform, with the
detail
containing the original message. TheIoErrorKind
is always maintained. Thedetail
also includes additional information (most notably the relevant path, but also other parameters or contextual information).I added an
UpdateIoError
trait to make it easier to do these in-place modification, and I'm eager for feedback on the specific strategy.