Allow interpolated strings and adjacent strings to be compile-time constants.

frog/value.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 CallingContext {
   MemberSet findMembers(String name);
   CounterLog get counters();
   Library get library();
   bool get isStatic();
@@ skipping 886 matching lines @@
   final bool isConst;
 
   EvaluatedValue(this.isConst, Type type, SourceSpan span):
     super(type, '@@@', span);
 
   String get code() {
     world.internalError('Should not be getting code from raw EvaluatedValue',
       span);
   }
 
+  get actualValue() {
+    world.internalError('Should not be getting actual value '
+                        'from raw EvaluatedValue', span);
+  }
+
   bool get needsTemp() => false;
 
   EvaluatedValue get constValue() => this;
 
   // TODO(jimhug): Using computed code here without caching is major fear.
   int hashCode() => code.hashCode();
 
   bool operator ==(var other) {
     return other is EvaluatedValue && other.type == this.type &&
       other.code == this.code;
@@ skipping 324 matching lines @@
             }
           }
           break;
       }
     }
     buf.add('"');
     return buf.toString();
   }
 }
 
-
 class ListValue extends EvaluatedValue {
   final List<Value> values;
 
   ListValue(this.values, bool isConst, Type type, SourceSpan span):
     super(isConst, type, span);
 
   String get code() {
     final buf = new StringBuffer();
     buf.add('[');
     for (var i = 0; i < values.length; i++) {
@@ skipping 371 matching lines @@
     }
     return super.unop(kind, context, node);
   }
   Value binop(int kind, var other, CallingContext context, var node) {
     if (value != null) {
       return replaceValue(value.binop(kind, _unwrap(other), context, node));
     }
     return super.binop(kind, other, context, node);
   }
 }