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Understanding the Go compiler: The Parser | Internals for interns In the previous blog post, we explored the scanner—the component that converts your source code from a stream of characters into a stream of tokens. Now we’re ready for the next step: the parser. Here’s the challenge the parser solves: right now, we have a flat list of tokens with no relationships between them. The scanner gave us package, main, {, fmt, ., Println… but it has no idea that Println belongs to the fmt package, or that the entire fmt.Println("Hello world") statement lives inside the main function. https://internals-for-interns.com/posts/the-go-parser/