doc: Add the lexer feature to the examples

The lexer feature bled into the examples due to `lalrpop-test` already
specifying it.

Fixes #513

.travis.yml

@@ -11,6 +11,11 @@ install:
 script:
 - RUST_BACKTRACE=1 CARGO_INCREMENTAL=0 cargo build -p lalrpop
 - RUST_BACKTRACE=1 CARGO_INCREMENTAL=0 travis_wait cargo test --all --all-features
+# Check the documentation examples separately so that the `lexer` feature specified in tests do not
+# leak into them
+- RUST_BACKTRACE=1 CARGO_INCREMENTAL=0 cargo check -p calculator
+- RUST_BACKTRACE=1 CARGO_INCREMENTAL=0 cargo check -p pascal
+- RUST_BACKTRACE=1 CARGO_INCREMENTAL=0 cargo check -p whitespace
 - bash tools/build-doc
 deploy:
   provider: pages

doc/calculator/Cargo.toml

@@ -8,6 +8,7 @@ workspace = "../.."
 [build-dependencies.lalrpop]
 version = "0.18.1"
 path = "../../lalrpop"
+features = ["lexer"]
 
 [dependencies]
 regex = "1"

doc/pascal/lalrpop/Cargo.toml

@@ -6,6 +6,7 @@ build = "build.rs"
 
 [build-dependencies.lalrpop]
 path = "../../../lalrpop"
+features = ["lexer"]
 
 [dependencies]
 docopt = "1.0"

doc/src/quick_start_guide.md

@@ -1,6 +1,6 @@
 For getting started with LALRPOP, it's probably best if you read
 [the tutorial](tutorial/index.md), which will introduce you
-to the syntax of LALRPOP files and so forth. 
+to the syntax of LALRPOP files and so forth.
 
 But if you've done this before, or you're just the impatient sort,
 here is a quick 'cheat sheet' for setting up your project.  First, add
@@ -24,6 +24,8 @@ regex = "1"
 # Add a build-time dependency on the lalrpop library:
 [build-dependencies]
 lalrpop = "0.18.1"
+# If you do not supply your own, external lexer you also need the `lexer` feature
+# lalrpop = { version = "0.18.1", features = ["lexer"] }
 ```
 
 Next create a `build.rs` file that looks like: