visitPipe method
Implementation
@override
AST visitPipe(BindingPipe ast, _) =>
    BindingPipe(ast.exp.visit(this), ast.name, _visitAll(ast.args));@override
AST visitPipe(BindingPipe ast, _) =>
    BindingPipe(ast.exp.visit(this), ast.name, _visitAll(ast.args));