1// Copyright 2012 The Go Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style 3// license that can be found in the LICENSE file. 4 5// variable declarations 6 7package decls1 8 9import ( 10 "math" 11) 12 13// Global variables without initialization 14var ( 15 a, b bool 16 c byte 17 d uint8 18 r rune 19 i int 20 j, k, l int 21 x, y float32 22 xx, yy float64 23 u, v complex64 24 uu, vv complex128 25 s, t string 26 array []byte 27 iface interface{} 28 29 blank _ /* ERROR "cannot use _" */ 30) 31 32// Global variables with initialization 33var ( 34 s1 = i + j 35 s2 = i /* ERROR "mismatched types" */ + x 36 s3 = c + d 37 s4 = s + t 38 s5 = s /* ERROR "invalid operation" */ / t 39 s6 = array[t1] 40 s7 = array[x /* ERROR "integer" */] 41 s8 = &a 42 s10 = &42 /* ERROR "cannot take address" */ 43 s11 = &v 44 s12 = -(u + *t11) / *&v 45 s13 = a /* ERROR "shifted operand" */ << d 46 s14 = i << j 47 s18 = math.Pi * 10.0 48 s19 = s1 /* ERROR "cannot call" */ () 49 s20 = f0 /* ERROR "no value" */ () 50 s21 = f6(1, s1, i) 51 s22 = f6(1, s1, uu /* ERRORx `cannot use .* in argument` */ ) 52 53 t1 int = i + j 54 t2 int = i /* ERROR "mismatched types" */ + x 55 t3 int = c /* ERRORx `cannot use .* variable declaration` */ + d 56 t4 string = s + t 57 t5 string = s /* ERROR "invalid operation" */ / t 58 t6 byte = array[t1] 59 t7 byte = array[x /* ERROR "must be integer" */] 60 t8 *int = & /* ERRORx `cannot use .* variable declaration` */ a 61 t10 *int = &42 /* ERROR "cannot take address" */ 62 t11 *complex64 = &v 63 t12 complex64 = -(u + *t11) / *&v 64 t13 int = a /* ERROR "shifted operand" */ << d 65 t14 int = i << j 66 t15 math /* ERROR "math is not a type" */ 67 t16 math.xxx /* ERROR "undefined" */ 68 t17 math /* ERROR "not a type" */ .Pi 69 t18 float64 = math.Pi * 10.0 70 t19 int = t1 /* ERROR "cannot call" */ () 71 t20 int = f0 /* ERROR "no value" */ () 72 t21 int = a /* ERRORx `cannot use .* variable declaration` */ 73) 74 75// Various more complex expressions 76var ( 77 u1 = x /* ERROR "not an interface" */ .(int) 78 u2 = iface.([]int) 79 u3 = iface.(a /* ERROR "not a type" */ ) 80 u4, ok = iface.(int) 81 u5, ok2, ok3 = iface /* ERROR "assignment mismatch" */ .(int) 82) 83 84// Constant expression initializations 85var ( 86 v1 = 1 /* ERROR "mismatched types untyped int and untyped string" */ + "foo" 87 v2 = c + 255 88 v3 = c + 256 /* ERROR "overflows" */ 89 v4 = r + 2147483647 90 v5 = r + 2147483648 /* ERROR "overflows" */ 91 v6 = 42 92 v7 = v6 + 9223372036854775807 93 v8 = v6 + 9223372036854775808 /* ERROR "overflows" */ 94 v9 = i + 1 << 10 95 v10 byte = 1024 /* ERROR "overflows" */ 96 v11 = xx/yy*yy - xx 97 v12 = true && false 98 v13 = nil /* ERROR "use of untyped nil" */ 99 v14 string = 257 // ERRORx `cannot use 257 .* as string value in variable declaration$` 100 v15 int8 = 257 // ERRORx `cannot use 257 .* as int8 value in variable declaration .*overflows` 101) 102 103// Multiple assignment expressions 104var ( 105 m1a, m1b = 1, 2 106 m2a, m2b, m2c /* ERROR "missing init expr for m2c" */ = 1, 2 107 m3a, m3b = 1, 2, 3 /* ERROR "extra init expr 3" */ 108) 109 110func _() { 111 var ( 112 m1a, m1b = 1, 2 113 m2a, m2b, m2c /* ERROR "missing init expr for m2c" */ = 1, 2 114 m3a, m3b = 1, 2, 3 /* ERROR "extra init expr 3" */ 115 ) 116 117 _, _ = m1a, m1b 118 _, _, _ = m2a, m2b, m2c 119 _, _ = m3a, m3b 120} 121 122// Declaration of parameters and results 123func f0() {} 124func f1(a /* ERROR "not a type" */) {} 125func f2(a, b, c d /* ERROR "not a type" */) {} 126 127func f3() int { return 0 } 128func f4() a /* ERROR "not a type" */ { return 0 } 129func f5() (a, b, c d /* ERROR "not a type" */) { return } 130 131func f6(a, b, c int) complex128 { return 0 } 132 133// Declaration of receivers 134type T struct{} 135 136func (T) m0() {} 137func (*T) m1() {} 138func (x T) m2() {} 139func (x *T) m3() {} 140 141// Initialization functions 142func init() {} 143func init /* ERROR "no arguments and no return values" */ (int) {} 144func init /* ERROR "no arguments and no return values" */ () int { return 0 } 145func init /* ERROR "no arguments and no return values" */ (int) int { return 0 } 146func (T) init(int) int { return 0 } 147