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68 lines
2.8 KiB
Swift
68 lines
2.8 KiB
Swift
// RUN: %target-typecheck-verify-swift -enable-experimental-feature VariadicGenerics
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// REQUIRES: asserts
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func debugPrint<T...>(_ items: T...)
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where T: CustomDebugStringConvertible
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{
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/*for (item: T) in items {
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stdout.write(item.debugDescription)
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}*/
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}
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func max<T...>(_ values: T...) -> T?
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where T: Comparable
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{
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return nil
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}
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func min<T...: Comparable>(_ values: T...) -> T? {
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return nil
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}
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func invalidPacks() {
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func monovariadic1() -> (String...) {} // expected-error {{variadic expansion 'String' must contain at least one variadic generic parameter}}
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func monovariadic2<T>() -> (T...) {} // expected-error {{variadic expansion 'T' must contain at least one variadic generic parameter}}
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func monovariadic3<T, U>() -> (T, U...) {} // expected-error {{variadic expansion 'U' must contain at least one variadic generic parameter}}
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}
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func call() {
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func multipleParameters<T...>(xs: T..., ys: T...) -> (T...) {
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return ((each xs)...)
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}
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multipleParameters()
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let x: (_: String) = multipleParameters(xs: "", ys: "")
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let (one, two) = multipleParameters(xs: "", 5.0, ys: "", 5.0)
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multipleParameters(xs: "", 5.0, ys: 5.0, "") // expected-error {{type of expression is ambiguous without more context}}
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func multipleSequences<T..., U...>(xs: T..., ys: U...) -> (T...) {
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return ((each ys)...)
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// expected-error@-1 {{cannot convert return expression of type '(U...)' to return type '(T...)'}}
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}
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multipleSequences()
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_ = multipleSequences(xs: "", ys: "")
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_ = multipleSequences(xs: "", 5.0, ys: 5.0, "")
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}
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func contextualTyping() {
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func firsts<T...>(_ seqs: [T]...) -> (T?...) {
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fatalError()
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}
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let (_, _): (Int?, String?) = firsts([42], [""]) // OK
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let (_, _): (String?, String?) = firsts([42], [""]) // expected-error {{cannot convert value of type '(Int?, String?)' to specified type '(String?, String?)'}}
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let (_, _): ([Int], String?) = firsts([42], [""]) // expected-error {{cannot convert value of type '(Int?, String?)' to specified type '([Int], String?)'}}
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let (_, _, _): (String?, String?, Int) = firsts([42], [""]) // expected-error {{'(Int?, String?)' is not convertible to '(String?, String?, Int)', tuples have a different number of elements}}
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func dependent<T...>(_ seqs: Array<T>...) -> (Array<T>.Element?...) {
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fatalError()
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}
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let (_, _): (Int?, String?) = dependent([42], [""]) // OK
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let (_, _): (String?, String?) = dependent([42], [""]) // expected-error {{cannot convert value of type '(Int?, String?)' to specified type '(String?, String?)'}}
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let (_, _): ([Int], String?) = dependent([42], [""]) // expected-error {{cannot convert value of type '(Int?, String?)' to specified type '([Int], String?)'}}
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let (_, _, _): (String?, String?, Int) = dependent([42], [""]) // expected-error {{'(Int?, String?)' is not convertible to '(String?, String?, Int)', tuples have a different number of elements}}
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}
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