Repro for go 1.10 bug with CoreFoundation types and cgo

file1_1.10.go

// +build darwin
// +build go1.10

package bugrepro

/*
#cgo LDFLAGS: -framework CoreFoundation

#include <CoreFoundation/CoreFoundation.h>
*/
import "C"

// If this function is moved to file2, compilation succeeds.

func returnsCFArrayRef() C.CFArrayRef {
	return C.CFArrayRef(0)
}

file1_pre1.10.go

// +build darwin
// +build !go1.10

package bugrepro

/*
#cgo LDFLAGS: -framework CoreFoundation

#include <CoreFoundation/CoreFoundation.h>
*/
import "C"

// If this function is moved to file2, compilation succeeds.

func returnsCFArrayRef() C.CFArrayRef {
	return C.CFArrayRef(nil)
}

file2.go

// +build darwin

package bugrepro

/*
#cgo LDFLAGS: -framework CoreFoundation -framework IOKit

#include <CoreFoundation/CoreFoundation.h>
*/
import "C"

// If this function is uncommented, compilation succeeds.
/*
func fn1() {
	var _ C.CFArrayRef
}
*/

func bugRepro() {
	arr := returnsCFArrayRef()
	// If arr is replaced with C.CFArrayRef(arr), compilation succeeds.
	C.CFArrayCreateCopy(nil, arr)
}