golang issue47704 代码
文件路径：/src/cmd/compile/internal/syntax/testdata/issue47704.go
// Copyright 2021 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 _() {
_ = m[] // ERROR expecting operand
_ = m[x,]
_ = m[x /* ERROR unexpected a */ a b c d]
}
// test case from the issue
func f(m map[int]int) int {
return m[0 // ERROR expecting comma, \: or \]
]
}