Added link for hygenic macro system in macros.md

christopherdumas · christopherdumas · commit 3fa1ee4677d7 · 2015-09-05T06:04:15.000-07:00
diff --git a/src/doc/trpl/macros.md b/src/doc/trpl/macros.md
@@ -313,7 +313,7 @@ fn main() {
 }
 ```
 
-This works because Rust has a [hygienic macro system][]. Each macro expansion
+This works because Rust has a [hygienic macro system][https://en.wikipedia.org/wiki/Hygienic_macro]. Each macro expansion
 happens in a distinct ‘syntax context’, and each variable is tagged with the
 syntax context where it was introduced. It’s as though the variable `state`
 inside `main` is painted a different "color" from the variable `state` inside

Original file line number	Diff line number	Diff line change
`@@ -313,7 +313,7 @@ fn main() {`
`313`	`313`	`}`
`314`	`314`	```
`315`	`315`
`316`		`-This works because Rust has a [hygienic macro system][]. Each macro expansion`
	`316`	`+This works because Rust has a [hygienic macro system][https://en.wikipedia.org/wiki/Hygienic_macro]. Each macro expansion`
`317`	`317`	`happens in a distinct ‘syntax context’, and each variable is tagged with the`
`318`	`318`	syntax context where it was introduced. It’s as though the variable `state`
`319`	`319`	inside `main` is painted a different "color" from the variable `state` inside