fix #549 export of properties

lib/src/compiler/code_generator.dart

Index: lib/src/compiler/code_generator.dart
diff --git a/lib/src/compiler/code_generator.dart b/lib/src/compiler/code_generator.dart
index 898c6b57be226f3406c2815c4d858c587801ca44..255f15931c429f5c653b581e0435d18102ae04d9 100644
--- a/lib/src/compiler/code_generator.dart
+++ b/lib/src/compiler/code_generator.dart
@@ -416,7 +416,12 @@ class CodeGenerator extends GeneralizingAstVisitor
       // Don't allow redefining names from this library.
       if (currentNames.containsKey(export.name)) continue;
 
-      _loader.emitDeclaration(export);
+      if (export.isSynthetic && export is PropertyInducingElement) {
+        _loader.emitDeclaration(export.getter);
+        _loader.emitDeclaration(export.setter);
+      } else {
+        _loader.emitDeclaration(export);
+      }
       if (export is ClassElement && export.typeParameters.isNotEmpty) {
         // Export the generic name as well.
         // TODO(jmesserly): revisit generic classes