Support unary minus operator (issue 3767)

compiler/javatests/com/google/dart/compiler/parser/SyntaxTest.java

 // Copyright (c) 2012, 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.
 
 package com.google.dart.compiler.parser;
 
 import com.google.common.base.Joiner;
 import com.google.dart.compiler.DartCompilerListener;
 import com.google.dart.compiler.DartSourceTest;
 import com.google.dart.compiler.ast.DartArrayLiteral;
@@ skipping 987 matching lines @@
           DartComment dartDoc = method.getDartDoc();
           assertNotNull(dartDoc);
           String commentCode = getNodeSource(code, dartDoc);
           assertTrue(commentCode.contains("DartDoc comment"));
           assertTrue(commentCode.contains("@override"));
         }
       }
     }
   }
 
+  public void test_operators_valid() throws Exception {
+    parseUnit("operators.dart",
+        Joiner.on("\n").join(
+            "class C {",
+            "  operator <(v) {}",
+            "  operator >(v) {}",
+            "  operator <=(v) {}",
+            "  operator >=(v) {}",
+            "  operator ==(v) {}",
+            "  operator -() {}",
+            "  operator -(v) {}",
+            "  operator +(v) {}",
+            "  operator /(v) {}",
+            "  operator ~/(v) {}",
+            "  operator *(v) {}",
+            "  operator %(v) {}",
+            "  operator |(v) {}",
+            "  operator ^(v) {}",
+            "  operator &(v) {}",
+            "  operator <<(v) {}",
+            "  operator >>(v) {}",
+            "  operator [](i) {}",
+            "  operator []=(i, v) {}",
+            "  operator ~() {}",
+            "}"));
+  }
+
   public void test_positionalDefaultValue() throws Exception {
     parseUnit("phony_test_abstract_var.dart",
         Joiner.on("\n").join(
             "method(arg=1) {",
             "}"),
             ParserErrorCode.DEFAULT_POSITIONAL_PARAMETER, 1, 8);
   }
 
   public void test_abstractInInterface() throws Exception {
     parseUnit("phony_test_abstract_in_interface.dart",
@@ skipping 113 matching lines @@
             "typedef func(var arg());",
             ParserErrorCode.FUNCTION_TYPED_PARAMETER_IS_VAR, 1, 18);
   }
 
   public void test_finalInFunctionType() throws Exception {
     parseUnit("phony_var_in_function_type.dart",
             "typedef func(final arg());",
             ParserErrorCode.FUNCTION_TYPED_PARAMETER_IS_FINAL, 1, 20);
   }
 }