Macro hygiene is the concept of macros that work in all contexts; they don't affect and aren't affected by anything around them. Ideally all macros would be fully hygienic, but there are lots of pitfalls and traps that make it all too easy to accidentally write unhygienic macros. This guide attempts to provide a comprehensive resource for writing the most hygienic macros.
First, a little aside on the details of Rust's module system, and specifically paths; it is
| macro_rules! debug_dbg { | |
| ($($x: tt)*) => {{ | |
| if cfg!(debug_assertions) { | |
| dbg!($($x)*) | |
| } else { | |
| $($x)* | |
| } | |
| }} | |
| } |
| with import <nixpkgs> { | |
| overlays = map (uri: import (fetchTarball uri)) [ | |
| https://github.com/mozilla/nixpkgs-mozilla/archive/master.tar.gz | |
| ]; | |
| }; | |
| stdenv.mkDerivation { | |
| name = "rust-wasm"; | |
| buildInputs = [ | |
| cargo-web |
| #!/bin/bash | |
| diff=$(cargo fmt -- --check) | |
| result=$? | |
| if [[ ${result} -ne 0 ]] ; then | |
| cat <<\EOF | |
| There are some code style issues, run `cargo fmt` first. | |
| EOF | |
| exit 1 |
| extern crate rayon; | |
| use rayon::iter::IntoParallelIterator; | |
| use rayon::iter::ParallelIterator; | |
| fn main() { | |
| let val = integral(|x| x * x, -1f64, 1f64); | |
| println!("{}", val); | |
| } | |
| fn integral<F>(fun: F, min: f64, max: f64) -> f64 |
| alias accio=wget | |
| alias avadaKedavra='rm -f' | |
| alias imperio=sudo | |
| alias priorIncantato='echo `history |tail -n2 |head -n1` | sed "s/[0-9]* //"' | |
| alias stupefy='sleep 5' | |
| alias wingardiumLeviosa=mv | |
| alias sonorus='set -v' | |
| alias quietus='set +v' |