We left our parser in an awful mess after the last video, so we're going to tidy it up a bit and make it easier to understand. You can find the sourc… ...more

We want to have a go at some type-checking, so the first step is to write some code that causes a type error. We are going for let x: i32 = 3.0;. To d… ...more

Finally, we are going to execute a real piece of code that actually looks like a programming language! We are setting a variable to a value, and then … ...more

We have been putting up with a weird problem with our lexer: up to now it requires white space between each token. But, last time we created a backtra… ...more

We've built a toy parser, but it's not going to last us. We need to make it a bit more proper. Specifically, we need to be able to look ahead, and the… ...more