comparisons.go

     1  // Copyright 2022 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  package comparisons
     6  
     7  type (
     8  	B int // basic type representative
     9  	A [10]func()
    10  	L []byte
    11  	S struct{ f []byte }
    12  	P *S
    13  	F func()
    14  	I interface{}
    15  	M map[string]int
    16  	C chan int
    17  )
    18  
    19  var (
    20  	b B
    21  	a A
    22  	l L
    23  	s S
    24  	p P
    25  	f F
    26  	i I
    27  	m M
    28  	c C
    29  )
    30  
    31  func _() {
    32  	_ = nil == nil // ERROR "operator == not defined on untyped nil"
    33  	_ = b == b
    34  	_ = a /* ERROR "[10]func() cannot be compared" */ == a
    35  	_ = l /* ERROR "slice can only be compared to nil" */ == l
    36  	_ = s /* ERROR "struct containing []byte cannot be compared" */ == s
    37  	_ = p == p
    38  	_ = f /* ERROR "func can only be compared to nil" */ == f
    39  	_ = i == i
    40  	_ = m /* ERROR "map can only be compared to nil" */ == m
    41  	_ = c == c
    42  
    43  	_ = b == nil /* ERROR "mismatched types" */
    44  	_ = a == nil /* ERROR "mismatched types" */
    45  	_ = l == nil
    46  	_ = s == nil /* ERROR "mismatched types" */
    47  	_ = p == nil
    48  	_ = f == nil
    49  	_ = i == nil
    50  	_ = m == nil
    51  	_ = c == nil
    52  
    53  	_ = nil /* ERROR "operator < not defined on untyped nil" */ < nil
    54  	_ = b < b
    55  	_ = a /* ERROR "operator < not defined on array" */ < a
    56  	_ = l /* ERROR "operator < not defined on slice" */ < l
    57  	_ = s /* ERROR "operator < not defined on struct" */ < s
    58  	_ = p /* ERROR "operator < not defined on pointer" */ < p
    59  	_ = f /* ERROR "operator < not defined on func" */ < f
    60  	_ = i /* ERROR "operator < not defined on interface" */ < i
    61  	_ = m /* ERROR "operator < not defined on map" */ < m
    62  	_ = c /* ERROR "operator < not defined on chan" */ < c
    63  }
    64  
    65  func _[
    66  	B int,
    67  	A [10]func(),
    68  	L []byte,
    69  	S struct{ f []byte },
    70  	P *S,
    71  	F func(),
    72  	I interface{},
    73  	J comparable,
    74  	M map[string]int,
    75  	C chan int,
    76  ](
    77  	b B,
    78  	a A,
    79  	l L,
    80  	s S,
    81  	p P,
    82  	f F,
    83  	i I,
    84  	j J,
    85  	m M,
    86  	c C,
    87  ) {
    88  	_ = b == b
    89  	_ = a /* ERROR "incomparable types in type set" */ == a
    90  	_ = l /* ERROR "incomparable types in type set" */ == l
    91  	_ = s /* ERROR "incomparable types in type set" */ == s
    92  	_ = p == p
    93  	_ = f /* ERROR "incomparable types in type set" */ == f
    94  	_ = i /* ERROR "incomparable types in type set" */ == i
    95  	_ = j == j
    96  	_ = m /* ERROR "incomparable types in type set" */ == m
    97  	_ = c == c
    98  
    99  	_ = b == nil /* ERROR "mismatched types" */
   100  	_ = a == nil /* ERROR "mismatched types" */
   101  	_ = l == nil
   102  	_ = s == nil /* ERROR "mismatched types" */
   103  	_ = p == nil
   104  	_ = f == nil
   105  	_ = i == nil /* ERROR "mismatched types" */
   106  	_ = j == nil /* ERROR "mismatched types" */
   107  	_ = m == nil
   108  	_ = c == nil
   109  
   110  	_ = b < b
   111  	_ = a /* ERROR "type parameter A is not comparable with <" */ < a
   112  	_ = l /* ERROR "type parameter L is not comparable with <" */ < l
   113  	_ = s /* ERROR "type parameter S is not comparable with <" */ < s
   114  	_ = p /* ERROR "type parameter P is not comparable with <" */ < p
   115  	_ = f /* ERROR "type parameter F is not comparable with <" */ < f
   116  	_ = i /* ERROR "type parameter I is not comparable with <" */ < i
   117  	_ = j /* ERROR "type parameter J is not comparable with <" */ < j
   118  	_ = m /* ERROR "type parameter M is not comparable with <" */ < m
   119  	_ = c /* ERROR "type parameter C is not comparable with <" */ < c
   120  }
   121
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