anchor.diff:    ///       (){ compute();completer.complete(result);}
     ///      ,...]}
     ///
  -  /// mutate calls, pops and adds to completer_pool.
  +  /// the method [mutate] calls, pops and adds to completer_pool.
     static Map<String, List<Function>> completer_pool = {};
     /// See the file mutator_example.dart
  -  /// in example folder.
  +  /// in example folder for usage.
     ///
     ///Takes:
     /// +  class name.
  
positive.code:   ///         invocation = invocation.join('.') +
    ///             '.set(\'${name}\', ${l.join('=')})';
    ///         return invocation;
    ///
    ///       }
    ///
    /// Only nodes of type T that match the
  
negative.code:   /// method, but mutate_t should be
    /// sufficient for most purposes.
    ///
    /// `required_import` option
    /// allows skipping running mutate on files
    /// that do not contain at least one of the
    /// packages.
    /// If not specified, no file is skipped.
    ///
    /// `alias_name`option should be set to modify
    /// a MethodInvocation of a function defined
    /// in an aliased file:
    /// e.g.
  