[winstonewert]

But the great thing about Rust is that the panic traces back to the exact place where I thought something couldn't be None, but it was. In Java, I frequently found it mysterious why some variable or parameter was unexpectedly null.

[mike_hearn]

Kotlin fixes that, fwiw. Nullity is checked and casted away at the earliest possible time (modulo some ergonomic constraints like a.b.c but modern JVMs give better errors for cases like that).