iter_variants 0.2.0

A way to iterate over all variants of a rust struct/enum
Documentation 
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# iter_variants

`cargo add iter_variants`

Provides a trait `IterVariants` with one method `iter_variants` that takes one argument, an `FnMut` that is called on all variants of the given struct/enum. For exampe, `bool::iter_variants(f)` would call `f(false)` and `f(true)`.

This is different to `strum::EnumIter` because this will iterate over all variants of contained data to any depth, and also works for structs, tuples, primitives and many core types.

There is a corresponding derive macro that implements `IterVariants` for enums and structs where all fields are either unit or only contain types that also implement `IterVariants`.

This crate is `no_std`.

Thanks to [@A4-Tacks](https://github.com/A4-Tacks) for work on generics and implementations for many core types.