anchor.diff:          }
           return result;
       }
  +    Contextual$Using $new$Contextual$Using([$dart$core.Object _$newValue]) => new Contextual$Using(this, _$newValue);
   }
   class Correspondence$keys$$anonymous$0_ implements Category {
       Correspondence $outer$ceylon$language$Correspondence;
  
positive.code:             $dart$core.bool doElse$11 = true;
              if (!(null == current)) {
                  doElse$11 = false;
                  return $capture$set$choosing.f(current, element);
              }
              if (doElse$11) {
                  return element;
  
negative.code:     }
  }
  class impl$MemberImpl implements serialization$Member {
      void _$init$impl$MemberImpl([$dart$core.int $bitmap, meta$declaration$FunctionOrValueDeclaration $$attribute]) {
          if (0 != ($bitmap & 1)) {
              meta$declaration$ValueDeclaration attribute$0;
              if (!($$attribute is meta$declaration$ValueDeclaration)) {
                  throw new AssertionError("Violated: is ValueDeclaration attribute");
              }
              attribute$0 = $$attribute as meta$declaration$ValueDeclaration;
              this.attribute = attribute$0;
          }
      }
      impl$MemberImpl([meta$declaration$FunctionOrValueDeclaration attribute]) : this.$d(1, attribute);
      impl$MemberImpl.$d([$dart$core.int $bitmap, meta$declaration$FunctionOrValueDeclaration $$attribute]) {
          _$init$impl$MemberImpl($bitmap | 1, $$attribute);
      }
      meta$declaration$ValueDeclaration attribute;
      $dart$core.Object referred([$dart$core.Object instance]) {
  