anchor.diff:        return;
   
       List<String> authArguments;
  -    String failureContext;
  -
  -    switch (ci) {
  +    /*late*/ String failureContext;
  +
  +    switch (ci/*!*/) {
         case ContinuousIntegrationEnvironment.luci:
           authArguments = <String>[
             'auth',
  
positive.code: 
    /// Create a digest from requested JSON.
    factory SkiaGoldDigest.fromJson(Map<String, dynamic> json) {
      if (json == null)
        return null;
  
      return SkiaGoldDigest(
        imageHash: json['digest'] as String,
        paramSet: Map<String, dynamic>.from(json['paramset'] as Map<String, dynamic> ??
  
negative.code:   /// The path to the local [Directory] where the goldctl tool is hosted.
    ///
    /// Uses the [platform] environment in this implementation.
    String/*!*/ get _goldctl => platform.environment[_kGoldctlKey];
  
    /// The path to the local [Directory] where the service account key is
    /// hosted.
    ///
    /// Uses the [platform] environment in this implementation.
    String/*!*/ get _serviceAccount => platform.environment[_kServiceAccountKey];
  
    /// Prepares the local work space for golden file testing and calls the
    /// goldctl `auth` command.
  