anchor.diff:  
     @override
     void visitFunctionTypeAlias(FunctionTypeAlias node) {
  -    if (!isInLibFolder) return;
  -
       if (!isPrivate(node.name)) {
         check(node);
       }
  
positive.code: 
    @override
    void visitCompilationUnit(CompilationUnit node) {
      // Ignore this compilation unit if it's not in the lib/ folder.
      isInLibFolder = isInLibDir(node, context.package);
      if (!isInLibFolder) return;
  
      final getters = <String, FunctionDeclaration>{};
      final setters = <FunctionDeclaration>[];
  
  
negative.code:   final LintRule rule;
    final LinterContext context;
  
    _Visitor(this.rule, this.context);
  
    bool check(Declaration node) {
  