anchor.diff:        bool strongMode,
         bool updateExpectations,
         bool updateComments,
  +      bool skipVm,
         this.uriTranslator,
         bool fullCompile,
         AstKind astKind)
  
positive.code:     bool strongMode = environment.containsKey(STRONG_MODE);
      bool updateExpectations = environment["updateExpectations"] == "true";
      bool updateComments = environment["updateComments"] == "true";
      String astKindString = environment[AST_KIND_INDEX];
      AstKind astKind =
          astKindString == null ? null : AstKind.values[int.parse(astKindString)];
      return new FastaContext(vm, strongMode, updateExpectations, updateComments,
          uriTranslator, environment.containsKey(ENABLE_FULL_COMPILE), astKind);
    }
  }
  
  
negative.code:                   : ".outline.expect",
                updateExpectations: updateExpectations)
          ] {
      if (fullCompile && !skipVm) {
        steps.add(const WriteDill());
        steps.add(const Run());
      }
  