src/cmd/asm/internal/asm/testdata/buildtagerror.s - go - Git at Google

 // 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.

 #define X 1

 //go:build x // ERROR "misplaced //go:build comment"
	// 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.

	#define X 1

	//go:build x // ERROR "misplaced //go:build comment"