chore: let travis build with dev channel of dart

.travis.yml

@@ -1,14 +1,7 @@
 language: dart
-dist: trusty
-sudo: false
-
-addons:
-  firefox: 53.0.3
-  apt:
-    packages:
-      - google-chrome-stable
 
 dart:
+  - dev
   - stable
   - 1.23.0
   - 1.22.0
@@ -26,7 +19,3 @@ script: ./build.sh
 branches:
   only:
     - master
-
-cache:
-  directories:
-    - $HOME/.pub-cache

build.sh

@@ -4,9 +4,18 @@
 set -e
 
 echo "Analyzing with `dartanalyzer --version`"
-dartanalyzer --strong --fatal-warnings lib/*.dart test/*.dart
+dartanalyzer="dartanalyzer --strong --fatal-warnings lib/*.dart test/*.dart"
+if [ "$TRAVIS_DART_VERSION" = "dev" ]; then
+  dartanalyzer="$dartanalyzer --preview-dart-2"
+fi
+$dartanalyzer
+
+pub deps
+
+# run the tests
+pub run test
 
-# Assert that code is formatted.
+# Only run with the stable version of dart.
 if [ "$TRAVIS_DART_VERSION" = "stable" ]; then
   pub global activate dart_style
   dirty_code=$(pub global run dart_style:format --dry-run lib/ test/ example/)
@@ -17,20 +26,16 @@ if [ "$TRAVIS_DART_VERSION" = "stable" ]; then
   else
     echo All Dart source files are formatted.
   fi
-fi
 
-# run the tests
-pub run test
+  # Install dart_coveralls; gather and send coverage data.
+  if [ "$COVERALLS_TOKEN" ]; then
+    pub global activate dart_coveralls
+    pub global run dart_coveralls report \
+      --retry 2 \
+      --exclude-test-files \
+      test/mustache_all.dart
+  fi
 
-# Install dart_coveralls; gather and send coverage data.
-if [ "$COVERALLS_TOKEN" ] && [ "$TRAVIS_DART_VERSION" = "stable" ]; then
-  pub global activate dart_coveralls
-  pub global run dart_coveralls report \
-    --retry 2 \
-    --exclude-test-files \
-    test/mustache_all.dart
-fi
 
-if [ "$TRAVIS_DART_VERSION" = "stable" ]; then
   pub run test -p chrome,firefox
 fi

lib/src/tokens.dart

@@ -300,7 +300,7 @@ class _StartSectionToken extends _ExpressionToken
     return str.toString();
   }
 
-  forEachUntilEndSection(void f(Token)) {
+  forEachUntilEndSection(void f(Token token)) {
     if (f == null) {
       throw new Exception('Can not apply a null function!');
     }

pubspec.yaml

@@ -6,4 +6,5 @@ homepage: https://github.com/valotas/mustache4dart
 environment:
   sdk: '>=0.8.10+6 <2.0.0'
 dev_dependencies:
-  test: '>=0.12.0 <0.13.0'
+  test: '>=0.12.0 <0.12.23'
+  isolate: '>=1.0.0 <1.1.0'