infer field formal parameter types

pkg/analyzer/test/src/task/strong_mode_test.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library test.src.task.strong_mode_test;
 
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/task/strong_mode.dart';
@@ skipping 940 matching lines @@
     MethodElement methodB = classB.getMethod(methodName);
     expect(methodB.returnType.isDynamic, isTrue);
     expect(methodB.type.typeArguments, [typeBE]);
 
     inferrer.inferCompilationUnit(unit);
 
     expect(methodB.returnType, classB.typeParameters[0].type);
     expect(methodB.type.typeArguments, [typeBE],
         reason: 'function type should still have type arguments');
   }
+
+  void test_inferCompilationUnit_fieldFormal() {
+    InstanceMemberInferrer inferrer = createInferrer;
+    String fieldName = 'f';
+    CompilationUnitElement unit = resolve('''
+class A {
+  final $fieldName = 0;
+  A([this.$fieldName = 'hello']);
+}
+''');
+    ClassElement classA = unit.getType('A');
+    FieldElement fieldA = classA.getField(fieldName);
+    FieldFormalParameterElement paramA =
+        classA.unnamedConstructor.parameters[0];
+    expect(fieldA.type.isDynamic, isTrue);
+    expect(paramA.type.isDynamic, isTrue);
+
+    inferrer.inferCompilationUnit(unit);
+
+    DartType intType = inferrer.typeProvider.intType;
+    expect(fieldA.type, intType);
+    expect(paramA.type, intType);
+  }
 }
 
 @reflectiveTest
 class VariableGathererTest extends AbstractContextTest {
   void test_creation_withFilter() {
     VariableFilter filter = (variable) => true;
     VariableGatherer gatherer = new VariableGatherer(filter);
     expect(gatherer, isNotNull);
     expect(gatherer.filter, filter);
   }
@@ skipping 50 matching lines @@
     }
   }
 }
 ''');
     CompilationUnit unit = context.resolveCompilationUnit2(source, source);
     VariableGatherer gatherer = new VariableGatherer(filter);
     unit.accept(gatherer);
     return gatherer.results;
   }
 }