The recent introduction of the go command in Go1 has spurred curiosity regarding its underlying functionality. Specifically, the presence of packages such as go/ast, go/token, and go/parser has raised questions about their role within the new compiler.
Contrary to expectations, the Go1 compiler remains predominantly written in C. Its lexer resides in src/cmd/gc/lex.c, while its Bison grammar is defined in src/cmd/gc/go.y. Therefore, the packages mentioned above are not utilized in the actual compilation process.
Instead, the go/ packages serve a critical purpose in a multitude of tools within the Go ecosystem. These tools include godoc for documentation generation, gofmt for code formatting, and various subcommands of the go tool.
Despite this current implementation, the prospect of a Go compiler written in Golang remains an intriguing possibility. However, substantial progress is yet to be made in this direction.
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