golang issue42686 代码
文件路径：/test/fixedbugs/issue42686.go
/ compile -goexperiment fieldtrack
/ Copyright 2020 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 p
func a(x struct{ f int }) { _ = x.f }
func b() { a(struct{ f int }{}) }