github.com/sean-/go@v0.0.0-20151219100004-97f854cd7bb6/test/rename.go (about)

     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  )