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fixed whitespace issues

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Jakob Demler 2017-02-15 21:21:31 +01:00
parent 9a39994ee3
commit 97451996e6
1 changed files with 3 additions and 1 deletions
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src/doc/book/src/procedural-macros.md
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@ -209,7 +209,9 @@ Ok so now, let's compile `hello-world`. Executing `cargo run` now yields:
Hello, World! My name is FrenchToast
Hello, World! My name is Waffles
```
## Custom Attributes
In some cases it might make sense to allow users some kind of configuration.
For our example the user might want to overwrite the name that is printed in the `hello_world()` method.
@ -240,8 +242,8 @@ pub fn hello_world(input: TokenStream) -> TokenStream
Multiple attributes can be specified that way.
## Raising Errors
Let's assume that we do not want to accept `Enums` as input to our custom derive method.
This condition can be easily checked with the help of `syn`.