1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
// RUN: %target-typecheck-verify-swift
enum E : String {
case foo = "foo"
case bar = "bar" // expected-note {{'bar' declared here}}
}
func fe(_: E) {}
func fe(_: Int) {}
func fe(_: Int, _: E) {}
func fe(_: Int, _: Int) {}
fe(E.baz) // expected-error {{type 'E' has no member 'baz'; did you mean 'bar'?}}
fe(.baz) // expected-error {{reference to member 'baz' cannot be resolved without a contextual type}}
fe(.nope, .nyet) // expected-error {{type 'Int' has no member 'nope'}}
// expected-error@-1 {{reference to member 'nyet' cannot be resolved without a contextual type}}
func fg<T>(_ f: (T) -> T) -> Void {}
fg({x in x}) // expected-error {{cannot infer type of closure parameter 'x' without a type annotation}}
struct S {
func f<T>(_ i: (T) -> T, _ j: Int) -> Void {}
func f(_ d: (Double) -> Double) -> Void {}
func test() -> Void {
f({x in x}, 2) // expected-error {{cannot infer type of closure parameter 'x' without a type annotation}}
}
func g<T>(_ a: T, _ b: Int) -> Void {}
func g(_ a: String) -> Void {}
func test2() -> Void {
g(.notAThing, 7) // expected-error {{cannot infer contextual base in reference to member 'notAThing'}}
}
func h(_ a: Int, _ b: Int) -> Void {}
func h(_ a: String) -> Void {}
func test3() -> Void {
h(.notAThing, 3) // expected-error {{type 'Int' has no member 'notAThing'}}
h(.notAThing) // expected-error {{type 'String' has no member 'notAThing'}}
}
}
struct School {
var name: String
}
func testDiagnoseForAmbiguityCrash(schools: [School]) {
schools.map({ $0.name }).sorted(by: { $0.nothing < $1.notAThing })
// expected-error@-1 {{value of type 'String' has no member 'nothing'}}
// expected-error@-2 {{value of type 'String' has no member 'notAThing'}}
}
class DefaultValue {
static func foo(_ a: Int) {}
static func foo(_ a: Int, _ b: Int = 1) {}
static func foo(_ a: Int, _ b: Int = 1, _ c: Int = 2) {}
}
DefaultValue.foo(1.0, 1) // expected-error {{cannot convert value of type 'Double' to expected argument type 'Int'}}
class Variadic {
static func foo(_ a: Int) {}
static func foo(_ a: Int, _ b: Double...) {}
}
Variadic.foo(1.0, 2.0, 3.0) // expected-error {{cannot convert value of type 'Double' to expected argument type 'Int'}}
// https://github.com/apple/swift/issues/50453
do {
class Suit {
static func foo<T: Any>(_ :inout T) {}
static func foo() {}
}
class RandomNumberGenerator {}
let myRNG = RandomNumberGenerator() // expected-note {{change 'let' to 'var' to make it mutable}}
_ = Suit.foo(&myRNG) // expected-error {{cannot pass immutable value as inout argument: 'myRNG' is a 'let' constant}}
}
// https://github.com/apple/swift/issues/50325
do {
struct S {
func foo() -> UInt { return 0 }
func foo<T: UnsignedInteger>(bar: T) -> T { // expected-note {{where 'T' = 'Int'}}
return bar
}
}
let s = S()
let a = s.foo()
let b = s.foo(bar: 123) // expected-error {{instance method 'foo(bar:)' requires that 'Int' conform to 'UnsignedInteger'}}
let c: UInt = s.foo(bar: 123)
let d = s.foo(bar: 123 as UInt)
}
// https://github.com/apple/swift/issues/49983
do {
struct ITunesGenre {
let genre: Int // expected-note {{'genre' declared here}}
let name: String
}
class Genre {
static func fetch<B: BinaryInteger>(genreID: B, name: String) {}
static func fetch(_ iTunesGenre: ITunesGenre) -> Genre {
return Genre.fetch(genreID: iTunesGenre.genreID, name: iTunesGenre.name)
// expected-error@-1 {{value of type 'ITunesGenre' has no member 'genreID'; did you mean 'genre'?}}
// expected-error@-2 {{cannot convert return expression of type '()' to return type 'Genre'}}
}
}
}
// https://github.com/apple/swift/issues/47730
protocol Scheduler {
func inBackground(run task: @escaping () -> Void)
}
extension Scheduler {
func inBackground(run task: @escaping () -> [Count],
completedBy resultHandler: @escaping ([Count]) -> Void) {}
}
struct Count { // expected-note {{'init(title:)' declared here}}
let title: String
}
func getCounts(_ scheduler: Scheduler, _ handler: @escaping ([Count]) -> Void) {
scheduler.inBackground(run: {
return [Count()] // expected-error {{missing argument for parameter 'title' in call}}
}, completedBy: { // expected-error {{contextual type for closure argument list expects 1 argument, which cannot be implicitly ignored}} {{20-20= _ in}}
})
}
// https://github.com/apple/swift/issues/55133
do {
func f(_ u: UnsafeBufferPointer<UInt16>) {}
let array : [UInt16]
array.withUnsafeBufferPointer {
_ = f(UnsafeRawPointer($0).bindMemory(to: UInt16.self, capacity: 1)) // expected-error {{cannot convert value of type 'UnsafePointer<UInt16>' to expected argument type 'UnsafeBufferPointer<UInt16>'}}
// expected-error@-1 {{cannot convert value of type 'UnsafeBufferPointer<UInt16>' to expected argument type 'UnsafeMutableRawPointer'}}
}
array.withUnsafeBufferPointer {
_ = UnsafeRawPointer($0) as UnsafeBufferPointer<UInt16> // expected-error {{cannot convert value of type 'UnsafeRawPointer' to type 'UnsafeBufferPointer<UInt16>' in coercion}}
// expected-error@-1 {{cannot convert value of type 'UnsafeBufferPointer<UInt16>' to expected argument type 'UnsafeMutableRawPointer'}}
}
}
do {
func f1(_ u: Int) -> String {} // expected-note 2 {{candidate expects value of type 'Int' for parameter #1 (got 'Double')}}
func f1(_ u: String) -> Double {} // expected-note 2 {{candidate expects value of type 'String' for parameter #1 (got 'Double')}}
func f2(_ u: Int) {}
f2(f1(1 as Double)) // expected-error {{no exact matches in call to local function 'f1'}}
f1(1 as Double) as Int // expected-error {{no exact matches in call to local function 'f1'}}
}
do {
// Ambiguous OverloadRefExpr
func f1(_ p: Int) {} // expected-note {{found candidate with type '(Int) -> ()'}}
func f1(_ p: Double) {} // expected-note {{found candidate with type '(Double) -> ()'}}
func f2(_ param: (String)-> Void) {}
f2(f1) // expected-error {{no 'f1' candidates produce the expected type '(String) -> Void' for parameter #0}}
}
// https://forums.swift.org/t/1-x-type-inference/69417/15
protocol N { associatedtype D }
infix operator ++ : AdditionPrecedence
infix operator -- : AdditionPrecedence
func ++ <T: N> (lhs: T, rhs: T) -> T.D { fatalError() } // expected-note {{found this candidate}}
func ++ <T: N> (lhs: T, rhs: T) -> T { fatalError() } // expected-note {{found this candidate}}
func -- <T: N> (lhs: T, rhs: T) -> T { fatalError() } // expected-note {{found this candidate}}
func -- <T: N> (lhs: T, rhs: T) -> T.D { fatalError() } // expected-note {{found this candidate}}
do {
struct MyInt16: N { typealias D = MyInt32 }
struct MyInt32: N { typealias D = MyInt64 }
struct MyInt64 {}
var i16 = MyInt16()
let _ = i16 ++ i16
// expected-error@-1 {{ambiguous use of operator '++'}}
let _ = i16 -- i16
// expected-error@-1 {{ambiguous use of operator '--'}}
}
|
