once_map 0.2.0

Single assignment maps
Documentation 
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# `once_map`

[![Crates.io](https://img.shields.io/crates/v/once_map.svg)](https://crates.io/crates/once_map)
[![Docs.rs](https://docs.rs/once_map/badge.svg)](https://docs.rs/once_map/)
![Minimum rustc version](https://img.shields.io/badge/rustc-1.56+-lightgray.svg)