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Co-Authored-By: Aleksandr Hovhannisyan <aleksandrhovhannisyan@gmail.com>
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Lasse Martin Jakobsen 2019-07-28 09:15:58 +02:00 committed by GitHub
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@ -1188,7 +1188,7 @@ As mentioned before, the above code will compile. The `NewNullWriter` returns a
> panic: runtime error: invalid memory address or nil pointer dereference
What happened? An interface method in Go is essentially a function pointer. In this case, since we are pointing to the function of an interface, rather than an actual method implementation, we are trying to invoke a function that's actually a `nil` pointer. To avoid this from happening, we would have to provide the `NulllWriter` with a struct which fulfills the interface contract, with actual implemented methods.
What happened? An interface method in Go is essentially a function pointer. In this case, since we are pointing to the function of an interface, rather than an actual method implementation, we are trying to invoke a function that's actually a `nil` pointer. To prevent this from happening, we would have to provide the `NulllWriter` with a struct that fulfills the interface contract, with actual implemented methods.
```go
func main() {