// https://pkg.go.dev/cmd/go/#hdr-The_go_mod_file.
//
// The [Parse] and [ParseLax] functions both parse a go.mod file and return an
// abstract syntax tree. ParseLax ignores unknown statements and may be used to
// parse go.mod files that may have been developed with newer versions of Go.
//
// The [File] struct returned by Parse and ParseLax represent an abstract
// go.mod file. File has several methods like [File.AddNewRequire] and