Support abstract getters without parameters.

dart/lib/compiler/implementation/ssa/nodes.dart

 // 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.
 
 interface HVisitor<R> {
   R visitAdd(HAdd node);
   R visitBailoutTarget(HBailoutTarget node);
   R visitBitAnd(HBitAnd node);
   R visitBitNot(HBitNot node);
   R visitBitOr(HBitOr node);
@@ skipping 1510 matching lines @@
   accept(HVisitor visitor) => visitor.visitForeignNew(this);
 }
 
 class HInvokeBinary extends HInvokeStatic {
   HInvokeBinary(HStatic target, HInstruction left, HInstruction right)
       : super(<HInstruction>[target, left, right]);
 
   HInstruction get left => inputs[1];
   HInstruction get right => inputs[2];
 
-  abstract BinaryOperation get operation();
+  abstract BinaryOperation get operation;
   abstract isBuiltin(HTypeMap types);
 }
 
 class HBinaryArithmetic extends HInvokeBinary {
   HBinaryArithmetic(HStatic target, HInstruction left, HInstruction right)
       : super(target, left, right);
 
   void prepareGvn(HTypeMap types) {
     // An arithmetic expression can take part in global value
     // numbering and do not have any side-effects if we know that all
@@ skipping 40 matching lines @@
     if (input == right && left.isNumber(types)) return HType.NUMBER;
     return HType.UNKNOWN;
   }
 
   HType computeLikelyType(HTypeMap types) {
     if (left.isTypeUnknown(types)) return HType.NUMBER;
     return HType.UNKNOWN;
   }
 
   // TODO(1603): The class should be marked as abstract.
-  abstract BinaryOperation get operation();
+  abstract BinaryOperation get operation;
 }
 
 class HAdd extends HBinaryArithmetic {
   HAdd(HStatic target, HInstruction left, HInstruction right)
       : super(target, left, right);
   accept(HVisitor visitor) => visitor.visitAdd(this);
 
   AddOperation get operation => const AddOperation();
   int typeCode() => HInstruction.ADD_TYPECODE;
   bool typeEquals(other) => other is HAdd;
@@ skipping 226 matching lines @@
     // If the outgoing type should be a number (integer, double or both) we
     // want the outgoing type to be the input too.
     // If we don't know the outgoing type we try to make it a number.
     if (propagatedType.isNumber()) return propagatedType;
     if (propagatedType.isUnknown()) return HType.NUMBER;
     return HType.UNKNOWN;
   }
 
   HType computeLikelyType(HTypeMap types) => HType.NUMBER;
 
-  abstract UnaryOperation get operation();
+  abstract UnaryOperation get operation;
 }
 
 class HNegate extends HInvokeUnary {
   HNegate(HStatic target, HInstruction input) : super(target, input);
   accept(HVisitor visitor) => visitor.visitNegate(this);
 
   NegateOperation get operation => const NegateOperation();
   int typeCode() => HInstruction.NEGATE_TYPECODE;
   bool typeEquals(other) => other is HNegate;
   bool dataEquals(HInstruction other) => true;
@@ skipping 313 matching lines @@
       }
     }
     return HType.UNKNOWN;
   }
 
   HType computeLikelyType(HTypeMap types) => HType.BOOLEAN;
 
   bool isBuiltin(HTypeMap types)
       => left.isNumber(types) && right.isNumber(types);
   // TODO(1603): the class should be marked as abstract.
-  abstract BinaryOperation get operation();
+  abstract BinaryOperation get operation;
 }
 
 class HEquals extends HRelational {
   HEquals(HStatic target, HInstruction left, HInstruction right)
       : super(target, left, right);
   accept(HVisitor visitor) => visitor.visitEquals(this);
 
   bool isBuiltin(HTypeMap types) {
     // All primitive types have === semantics.
     // Note that this includes all constants except the user-constructed
@@ skipping 628 matching lines @@
   HBasicBlock get start => expression.start;
   HBasicBlock get end {
     // We don't create a switch block if there are no cases.
     assert(!statements.isEmpty());
     return statements.last().end;
   }
 
   bool accept(HStatementInformationVisitor visitor) =>
       visitor.visitSwitchInfo(this);
 }