1# How to Contribute 2 3See the [clap-wide CONTRIBUTING.md](../CONTRIBUTING.md). This will contain `clap_derive` specific notes. 4 5## Derive Gotchas 6 7- Always prefix generated variables with `__clap_` to minimize clashes with the user's variables, see [#2934](https://github.com/clap-rs/clap/issues/2934). 8- Prefer the path `clap` over `::clap` to allow users to re-export clap, see [#2258](https://github.com/clap-rs/clap/pull/2258). 9- Prefer substituting variable names to avoid problems with `macro_rules`, see [#2823](https://github.com/clap-rs/clap/pull/2823). 10- Prefer `::std::result::Result` and `::std::option::Option`, see [#3092](https://github.com/clap-rs/clap/pull/3092). 11- Put whitespace between `#quoted #variables`. 12