$ cat test.cdc
pub fun main(): Int {
  log("Hello, world!")
  return 0
}

$ cadence test.cdc
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
	panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x11ff038]

goroutine 1 [running]:
github.com/onflow/cadence/runtime/interpreter.recoverErrors(0xc000237ec0)
	github.com/onflow/cadence/runtime/interpreter/interpreter.go:861 +0x15a
panic(0x12b6200, 0x1566630)
	runtime/panic.go:969 +0x175
github.com/onflow/cadence/runtime/interpreter.HostFunctionValue.Invoke(...)
	github.com/onflow/cadence/runtime/interpreter/function.go:154
github.com/onflow/cadence/runtime/interpreter.(*Interpreter).functionValueInvocationTrampoline(0xc00046a000, 0x137e980, 0xc000184000, 0xc000184650, 0x1, 0x1, 0xc00004ff50, 0x1, 0x1, 0xc00004ff60, ...)
	github.com/onflow/cadence/runtime/interpreter/interpreter.go:2101 +0x31a
github.com/onflow/cadence/runtime/interpreter.(*Interpreter).VisitInvocationExpression.func1.1(0x130aa20, 0xc00040ba10, 0xc000182de0, 0x1339a7240137bd00)
	github.com/onflow/cadence/runtime/interpreter/interpreter.go:2019 +0x2c8
github.com/onflow/cadence/runtime/trampoline.FlatMap.FlatMap.func1(0x130aa20, 0xc00040ba10, 0x137bd00, 0xc00040ba10)
	github.com/onflow/cadence/runtime/trampoline/trampoline.go:142 +0x42
github.com/onflow/cadence/runtime/trampoline.FlatMap.FlatMap.func1(0x130aa20, 0xc00040ba10, 0x12a0fe0, 0xc000183280)
	github.com/onflow/cadence/runtime/trampoline/trampoline.go:142 +0x42
github.com/onflow/cadence/runtime/trampoline.FlatMap.Resume.func1(0xc000183260, 0x12a0fe0)
	github.com/onflow/cadence/runtime/trampoline/trampoline.go:154 +0x37
github.com/onflow/cadence/runtime/interpreter.(*Interpreter).runUntilNextStatement(0xc00046a000, 0x137bd00, 0xc000183260, 0x0, 0x0, 0xc000182e40)
	github.com/onflow/cadence/runtime/interpreter/interpreter.go:605 +0x32
github.com/onflow/cadence/runtime/interpreter.(*Interpreter).runAllStatements(0xc00046a000, 0x137bd00, 0xc000182c20, 0x0, 0x0)
	github.com/onflow/cadence/runtime/interpreter/interpreter.go:617 +0x53
github.com/onflow/cadence/runtime/interpreter.(*Interpreter).Invoke(0xc00046a000, 0x132075b, 0x4, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
	github.com/onflow/cadence/runtime/interpreter/interpreter.go:832 +0x114
github.com/onflow/cadence/runtime/cmd/execute.Execute(0xc0000b2030, 0x1, 0x1)
	github.com/onflow/cadence/runtime/cmd/execute/execute.go:41 +0xd0
main.main()
	github.com/onflow/cadence/runtime/cmd/main/main.go:29 +0x56

$ cat test.cdc
pub fun main(): Int {
//  log("Hello, world!")
  return 0
}

$ cadence test.cdc && echo YES
YES