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Merge pull request #151 from zicklag/patch-2

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[Docs] Add Cargo Expand to Macro Debugging Tips
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Carter Anderson 2020-08-12 18:50:03 -07:00 committed by GitHub
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docs/debugging.md
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## Macro Debugging ## Macro Debugging
* Print the final output of a macro using ```cargo rustc --profile=check -- -Zunstable-options --pretty=expanded``` - Print the final output of a macro using `cargo rustc --profile=check -- -Zunstable-options --pretty=expanded`
* Print output during macro compilation using ```eprintln!("hi");``` - Alternatively you could install and use [cargo expand](https://github.com/dtolnay/cargo-expand) which adds syntax highlighting to the terminal output.
- Additionally get pager by piping to `less` ( on Unix systems ): `cargo expand --color always | less -R`
- Print output during macro compilation using `eprintln!("hi");`