//golangcitest:args -Enilnil package testdata /* #include #include void myprint(char* s) { printf("%d\n", s); } */ import "C" import ( "unsafe" ) func _() { cs := C.CString("Hello from stdio\n") C.myprint(cs) C.free(unsafe.Pointer(cs)) } func _() (unsafe.Pointer, error) { return nil, nil // want "return both a `nil` error and an invalid value: use a sentinel error instead" }