Generated front_end/testcases/inference test files from Analyzer tests.

pkg/front_end/testcases/inference/conflicts_can_happen.dart

+// Copyright (c) 2017, 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.
+
+/*@testedFeatures=inference*/
+library test;
+
+class I1 {
+  int x;
+}
+
+class I2 extends I1 {
+  int y;
+}
+
+class A {
+  final I1 a = null;
+}
+
+class B {
+  final I2 a = null;
+}
+
+class C1 implements A, B {
+  /*error:INVALID_METHOD_OVERRIDE*/ get a => null;
+}
+
+// Still ambiguous
+class C2 implements B, A {
+  /*error:INVALID_METHOD_OVERRIDE*/ get a => null;
+}