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0a8f596736
Detect and diagnose contextual failures originating in an attempt
to convert `nil` to some other non-optional type e.g.
```swift
let _: Int = nil // can't initialize `Int` with `nil`
func foo() -> Int {
return nil // can't return `nil` from `foo`
}
_ = 1 + nil // there is no `+` overload which accepts `Int` and optional
```
25 lines
620 B
Swift
25 lines
620 B
Swift
// RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -typecheck -verify %s
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// REQUIRES: objc_interop
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import Foundation
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protocol A: RawRepresentable {}
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extension A {
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static func +(lhs: RawValue, rhs: Self) -> Self {
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fatalError()
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}
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}
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class Foo<Bar: NSObject> {
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var foobar: Bar {
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fatalError()
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}
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lazy var foo: () -> Void = {
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// TODO: improve diagnostic message
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_ = self.foobar + nil // expected-error {{'Bar' is not convertible to 'String'; did you mean to use 'as!' to force downcast?}}
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// expected-error@-1 {{'nil' is not compatible with expected argument type 'String'}}
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}
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}
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