go/src/cmd/compile/internal/syntax/dumper.go

// Fdump dumps the structure of the syntax tree rooted at n to w.
// It is intended for debugging purposes; no specific output format
// is guaranteed.
func Fdump(w io.Writer, n Node) (err error) { … }

type dumper …

var indentBytes …

func (p *dumper) Write(data []byte) (n int, err error) { … }

type writeError …

// printf is a convenience wrapper that takes care of print errors.
func (p *dumper) printf(format string, args ...interface{ … }

// dump prints the contents of x.
// If x is the reflect.Value of a struct s, where &s
// implements Node, then &s should be passed for n -
// this permits printing of the unexported span and
// comments fields of the embedded isNode field by
// calling the Span() and Comment() instead of using
// reflection.
func (p *dumper) dump(x reflect.Value, n Node) { … }

func isExported(name string) bool { … }