``` go package main func hello() func() string { return nil } func main() { hello()() // This should have a warning as it will crash when hello() returns nil } ``` Running the example above: ``` panic: runtime error: invalid memory address or nil pointer dereference [signal 0xb code=0xffffffff addr=0x0 pc=0x20016] goroutine 1 [running]: main.main() /tmp/sandbox522197955/main.go:8 +0x16 ```