## Why does Sorbet think this is `nil`? I just checked that it's not!| sorbet.org
There are five ways to assert the types of expressions in Sorbet:| sorbet.org
> This page describes the syntax of method signatures, or `sig`s. For a complete| sorbet.org
Sorbet has syntax for creating generic methods, classes, and interfaces.| sorbet.org
RBI files are "Ruby Interface" files. Sorbet uses RBI files to learn about| sorbet.org