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Go is a Go library that uses Go’s grammar system to create parsers. The Go library uses a different approach on creating parsers with Go. Parsing is all about taking a stream of tokens and building a parse tree from it (iff the syntax matches the grammar) Go uses go.mod files to manage your Go project dependencies. Go.mod is written in pure Go and parsers are written in Go's Go grammar system. Go's grammar system uses Go's “struct tags” to define the grammar of the language.