Context *Context

	// GoVersion describes the accepted Go language version. The string must
	// start with a prefix of the form "go%d.%d" (e.g. "go1.20", "go1.21rc1", or
	// "go1.21.0") or it must be empty; an empty string disables Go language
	// version checks. If the format is invalid, invoking the type checker will
	// result in an error.
	GoVersion string

	Context *Context

	// GoVersion describes the accepted Go language version. The string must
	// start with a prefix of the form "go%d.%d" (e.g. "go1.20", "go1.21rc1", or
	// "go1.21.0") or it must be empty; an empty string disables Go language
	// version checks. If the format is invalid, invoking the type checker will
	// result in an error.
	GoVersion string

	Syntax     *Line
}

// A Go is the go statement.
type Go struct {
	Version string // "1.23"
	Syntax  *Line
}

// A Toolchain is the toolchain statement.
type Toolchain struct {
	Name   string // "go1.21rc1"
	Syntax *Line
}

// A Godebug is a single godebug key=value statement.
type Godebug struct {
	Key    string
	Value  string
	Syntax *Line
}

// An Exclude is a single exclude statement.