chainerror/booksrc/tutorial12.md

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# Deref for the ErrorKind
Because ChainError<T> implements Deref to &T, we can also match on `*e` instead of `e.kind()`.
~~~rust
use crate::chainerror::*;
{{#include ../examples/tutorial12.rs:2:}}
# #[allow(dead_code)]
# mod chainerror {
{{#includecomment ../src/lib.rs}}
# }
~~~