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c30845fa74
Introduce a fix to detect and diagnose situations when omitted
generic arguments couldn't be deduced by the solver based on
the enclosing context.
Example:
```swift
struct S<T> {
}
_ = S() // There is not enough context to deduce `T`
```
Resolves: rdar://problem/51203824
32 lines
988 B
Swift
32 lines
988 B
Swift
// RUN: %target-typecheck-verify-swift
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struct D {}
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class Future<T> {
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func then<U>(_ fn: @escaping (T) -> Future<U>) -> Future<U> { fatalError() } // expected-note {{in call to function 'then'}}
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func thenThrowing<U>(_ fn: @escaping (T) throws -> U) -> Future<U> { fatalError() }
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func whenFailure(_ fn: @escaping (Error) -> Void) {}
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func and<U>(result: U) -> Future<(T,U)> { fatalError() }
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}
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protocol P {
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func foo(arr: [D], data: ArraySlice<UInt8>) -> Future<D>
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func bar(root: D, from: P) -> Future<D>
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}
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extension P {
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func foo(arr: [D] = [], data: [UInt8]) -> Future<D> { fatalError() }
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}
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func crash(_ p: P, payload: [UInt8]) throws {
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p.foo(data: payload).then { _ in
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return Future<(D, [D])>()
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}.then { (id, arr) in // expected-error {{generic parameter 'U' could not be inferred}}
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p.foo(arr: arr, data: []).and(result: (id, arr))
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}.then { args0 in
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let (parentID, args1) = args0
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p.bar(root: parentID, from: p).and(args1)
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}.whenFailure { _ in }
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}
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