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22 lines
785 B
Markdown
22 lines
785 B
Markdown
# ErrorKind to the rescue
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To cope with different kind of errors, we introduce the `kind` of an error `Func1ErrorKind` with an enum.
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Because we derive `Debug` and implement `Display` our `Func1ErrorKind` enum, this enum can be used as
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a `std::error::Error`.
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Only returning `Func1ErrorKind` in `func1()` now let us get rid of `Result<(), Box<Error + Send + Sync>>` and we can
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use `ChainResult<(), Func1ErrorKind>`.
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In `main` we can now directly use the methods of `chainerror::Error<T>` without downcasting the error first.
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Also, a nice `match` on `chainerror::Error<T>.kind()` is now possible, which returns `&T`, meaning `&Func1ErrorKind` here.
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~~~rust
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{{#include ../examples/tutorial10.rs}}
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# #[allow(dead_code)]
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# mod chainerror {
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{{#rustdoc_include ../src/lib.rs:-1}}
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# }
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~~~
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