type DebugConfig struct {
	// Filter is called before each value in a syntax tree.
	// Values for which the function returns false are omitted.
	Filter func(reflect.Value) bool

	// OmitEmpty causes empty strings, empty structs, empty lists,
	// nil pointers, invalid positions, and missing tokens to be omitted.
	OmitEmpty bool

	// IncludeNodeRefs causes a Node reference in an identifier
	// to indicate which (if any) ast.Node it refers to.
	IncludeNodeRefs bool

	// IncludePointers causes all nodes to be printed with their pointer
	// values; setting this also implies [DebugConfig.IncludeNodeRefs]
	// and references will be printed as pointers.
	IncludePointers bool
}