tests for nonfunction type aliases (#2533)

Author: pq

test/rules/experiments/nonfunction-type-aliases/rules/slash_for_doc_comments.dart

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+// 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.
+
+// test w/ `pub run test -N slash_for_doc_comments`
+
+/** lib */ //LINT
+library test.rules.slash_for_doc_comments;
+
+/** My class */ //LINT
+class A {}
+
+/// OK
+class B {
+
+  /** B */ //LINT
+  B();
+
+  /** x */ //LINT
+  var x;
+
+  /** y */ //LINT
+  y() {
+    /** l */ //LINT
+    void l() {}
+  }
+}
+
+/** G */ //LINT
+enum G {
+  /** A */ //LINT
+  A,
+  B
+}
+
+/** f */ //LINT
+typedef bool F();
+
+/** f */ //LINT
+typedef F2 = bool Function();
+
+/** z */ //LINT
+z() => null;
+
+/* meh */ //OK
+class C {}
+
+/** D */ //LINT
+var D = String;
+
+/** Z */ //LINT
+class Z = B with C;
+
+/** M1 */ //LINT
+mixin M1 {}
+
+/* meh */ //OK
+mixin M2 {}
+
+/** Ext */ //LINT
+extension Ext on Object {
+  /** e */ // LINT
+  void e() { }
+}
+
+/** Unnamed */ //LINT
+extension on A { }
+
+/** O */ //LINT
+typedef O = Object;
+
+/** OM */ //LINT
+class OM = Object with M;