You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: inspector.go
    path of file: ./repos/gccrs/libgo/go/golang.org/x/tools/go/ast/inspector
    
    the code of the file until where you have to start completion: // Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package inspector provides helper functions for traversal over the
// syntax trees of a package, including node filtering by type, and
// mater
    
func (in *Inspector) WithStack(types []ast.Node, f func(n ast.Node, push bool, stack []ast.Node) (proceed bool)) {
	mask := maskOf(types)
	var stack []ast.Node
	for i := 0; i < len(in.events); {
		ev := in.events[i]
		if ev.index > 0 {
			// push
			stack = append(stack, ev.node)
			if ev.typ&mask != 0 {
				if !f(ev.node, true, stack) {
					i = ev.index
					stack = stack[:len(stack)-1]
					continue
				}
			}
		} else {
			// pop
			if ev.typ&mask != 0 {
				f(ev.node, false, stack)
			}
			stack = stack[:len(stack)-1]
		}
		i++
	}
}