[Pigeon] fixed dart linter problem (#207)

packages/pigeon/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.1.6
+
+* Fixed unused variable linter warning in Dart code under certain conditions.
+
 ## 0.1.5
 
 * Made array datatypes correctly get imported and exported avoiding the need to

packages/pigeon/lib/dart_generator.dart

@@ -92,12 +92,12 @@ void _writeFlutterApi(Indent indent, Api api,
           indent.scoped('{', '});', () {
             final String argType = func.argType;
             final String returnType = func.returnType;
-            indent.writeln(
-                'final Map<dynamic, dynamic> mapMessage = message as Map<dynamic, dynamic>;');
             String call;
             if (argType == 'void') {
               call = 'api.${func.name}()';
             } else {
+              indent.writeln(
+                  'final Map<dynamic, dynamic> mapMessage = message as Map<dynamic, dynamic>;');
               indent.writeln(
                   'final $argType input = $argType._fromMap(mapMessage);');
               call = 'api.${func.name}(input)';

packages/pigeon/lib/generator_tools.dart

@@ -8,7 +8,7 @@ import 'dart:mirrors';
 import 'ast.dart';
 
 /// The current version of pigeon.
-const String pigeonVersion = '0.1.5';
+const String pigeonVersion = '0.1.6';
 
 /// Read all the content from [stdin] to a String.
 String readStdin() {

packages/pigeon/pubspec.yaml

@@ -1,5 +1,5 @@
 name: pigeon
-version: 0.1.5
+version: 0.1.6
 description: Code generator tool to make communication between Flutter and the host platform type-safe and easier.
 homepage: https://github.com/flutter/packages/tree/master/packages/pigeon
 dependencies:

packages/pigeon/run_tests.sh

@@ -42,7 +42,7 @@ test_pigeon_ios() {
     -o $temp_dir/pigeon.o
 
   dartfmt -w $temp_dir/pigeon.dart
-  dartanalyzer $temp_dir/pigeon.dart --packages ./e2e_tests/test_objc/.packages
+  dartanalyzer $temp_dir/pigeon.dart --fatal-infos --fatal-warnings --packages ./e2e_tests/test_objc/.packages
   rm -rf $temp_dir
 }