Clive, 2nd ed. User's manual. Section 2 
SYNOPSYS

import "clive/dbg"

var ExitDumpsStacks bool
func Exit(args ...interface{})
func Fatal(args ...interface{})
func HexStr(data []byte, n int) string
func Printf(str string, args ...interface{}) (n int, err error)
func Str(s string, n int) string
func Warn(str string, args ...interface{}) (n int, err error)
func FlagPrintf(flag *bool) PrintFunc
type Flag struct { ... }
type PrintFunc func(fmts string, arg ...interface{}) (int, error)
    func FlagPrintf(flag *bool) PrintFunc

DESCRIPTION

Debug tools

CONSTANTS

TYPES

type Flag struct {
	Tag   string // prefixing debug prints
	Debug bool   // enable debug prints
}
    To be embedded in structures to add a debug flag and Dprintf function.

func (d Flag) Dprintf(str string, args ...interface{}) (n int, err error)
    Printf with d.Tag if d.Debug is set

type PrintFunc func(fmts string, arg ...interface{}) (int, error)
    Print functions generated by FlagPrintf.

func FlagPrintf(flag *bool) PrintFunc
    Return a function that calls Printf but only when flag is set.

FUNCTIONS

func Exit(args ...interface{})
    Exit with 0 or 1 depending on the args (like Fatal), but do not print.

func Fatal(args ...interface{})
    Warn and exit

func HexStr(data []byte, n int) string
    Return a string with the hex dump of at most n bytes from data (all if n is
    0) for debugging.

func Printf(str string, args ...interface{}) (n int, err error)
    Atomic print to stderr

func Str(s string, n int) string
    Return a string with at most n runes for debugging

func Warn(str string, args ...interface{}) (n int, err error)
    Printf to stderr, prefixed with program name and terminating with \n. Each
    warn is atomic.

VARIABLES

var (
	ExitDumpsStacks bool // If set Fatal/Exit will dump the stacks

)

User's manual, 2nd ed. Section 2