Use stable rustfmt-preview

.travis.yml

@@ -2,15 +2,11 @@ language: rust
 
 matrix:
   include:
-
-    - rust: nightly-2018-01-26
+    - rust: stable
       before_script:
         - rustup component add rustfmt-preview
       script:
-        - cargo fmt -- --write-mode=diff
-
-    - rust: stable
-      script:
+        - cargo fmt --all -- --write-mode=diff
         - cargo test
 
 branches:

src/parser/input.rs

@@ -5,9 +5,7 @@ use super::is_insignificant;
 use std::ops::{Add, AddAssign};
 
 pub(crate) struct ParserInput<'t> {
-    #[allow(unused)]
     text: &'t str,
-    #[allow(unused)]
     start_offsets: Vec<TextUnit>,
     tokens: Vec<Token>, // non-whitespace tokens
 }