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This commit executes maint/add_warning with the just added change to
deny string slices except in tests.
I recommend auditing this by checking out the previous commit followed
by running the script yourself and then verifying that the diff is
identical to this commit.
This commit makes cargo clippy fail. We will add exceptions in the next
commit.
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Previously, due to #2338, we would miss any error nested directly
inside an io::Error.
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Run maint/add_warning
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This is the major part of #1849.
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Instead of using complicated match statements, use downcasting
to find error types that define specific hints. This also lets us
define a reasonable hint-extractor for anyhow::Error, and use it
when reporting errors in main.
I've left an implementation of hint() in `impl Error`, to
avoid breaking backward compatibility.
Closes #1165.
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