golang issue18452 代码
文件路径：/misc/cgo/errors/testdata/issue18452.go
/ Copyright 2017 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.
/ Issue 18452: show pos info in undefined name errors
package p
import (
"C"
"fmt"
)
func a() {
fmt.Println("Hello, world!")
C.function_that_does_not_exist() / ERROR HERE
C.pi / ERROR HERE
}