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One approach would be to use the existing Go parser packages and modify them to suit your needs. Unfortunately (last time I checked) the standard library packages for this (go/ast, go/types, etc.) differ from the actual packages used by the Go compiler. But they might be close enough to suit your needs.

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I recall experimenting with that, but I had a hard time making them work correctly (although I don't recall the details--might've been something to do with their parser DSL or something). The compiler doesn't use the stdlib because the compiler was originally implemented in C, and then they did a mechanical C -> Go translation.

Didn't know that the compiler itself isn't using the same packages after going in a bootstrapped fashion.

Using the existing packages is a great approach as I think that Go standard library has one of the best packages supported for AST/lexing/parsing family, in comparison to Python and Ruby. Haven't worked with Rust.

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