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Make `ParseIntError` and `IntErrorKind` fully public Why would you write nice error types if I can't read them? # Why It can be useful to use `match` with errors produced when parsing strings to int. This would be useful for the `.err_match()` function in my [new crate](https://crates.io/crates/read_input). --- I could also do this for `ParseFloatError` if people think it is a good idea. I am new around hear so please tell me if I am getting anything wrong.