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      1 // run
      2 
      3 // Copyright 2009 The Go Authors. All rights reserved.
      4 // Use of this source code is governed by a BSD-style
      5 // license that can be found in the LICENSE file.
      6 
      7 // Test that predeclared names can be redeclared by the user.
      8 
      9 package main
     10 
     11 import (
     12 	"fmt"
     13 	"runtime"
     14 )
     15 
     16 func main() {
     17 	n :=
     18 		append +
     19 			bool +
     20 			byte +
     21 			complex +
     22 			complex64 +
     23 			complex128 +
     24 			cap +
     25 			close +
     26 			delete +
     27 			error +
     28 			false +
     29 			float32 +
     30 			float64 +
     31 			imag +
     32 			int +
     33 			int8 +
     34 			int16 +
     35 			int32 +
     36 			int64 +
     37 			len +
     38 			make +
     39 			new +
     40 			nil +
     41 			panic +
     42 			print +
     43 			println +
     44 			real +
     45 			recover +
     46 			rune +
     47 			string +
     48 			true +
     49 			uint +
     50 			uint8 +
     51 			uint16 +
     52 			uint32 +
     53 			uint64 +
     54 			uintptr +
     55 			iota
     56 	if n != NUM*(NUM-1)/2 {
     57 		fmt.Println("BUG: wrong n", n, NUM*(NUM-1)/2)
     58 		runtime.Breakpoint() // panic is inaccessible
     59 	}
     60 }
     61 
     62 const (
     63 	// cannot use iota here, because iota = 38 below
     64 	append     = 1
     65 	bool       = 2
     66 	byte       = 3
     67 	complex    = 4
     68 	complex64  = 5
     69 	complex128 = 6
     70 	cap        = 7
     71 	close      = 8
     72 	delete     = 9
     73 	error      = 10
     74 	false      = 11
     75 	float32    = 12
     76 	float64    = 13
     77 	imag       = 14
     78 	int        = 15
     79 	int8       = 16
     80 	int16      = 17
     81 	int32      = 18
     82 	int64      = 19
     83 	len        = 20
     84 	make       = 21
     85 	new        = 22
     86 	nil        = 23
     87 	panic      = 24
     88 	print      = 25
     89 	println    = 26
     90 	real       = 27
     91 	recover    = 28
     92 	rune       = 29
     93 	string     = 30
     94 	true       = 31
     95 	uint       = 32
     96 	uint8      = 33
     97 	uint16     = 34
     98 	uint32     = 35
     99 	uint64     = 36
    100 	uintptr    = 37
    101 	iota       = 38
    102 	NUM        = 39
    103 )
    104