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[stdlib] Add conditional Lazy conformance to Slice when Base is Lazy #13242

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Merged
merged 1 commit into from
Dec 4, 2017
Merged

[stdlib] Add conditional Lazy conformance to Slice when Base is Lazy #13242

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3 changes: 3 additions & 0 deletions stdlib/public/core/LazyCollection.swift.gyb
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Original file line number Diff line number Diff line change
Expand Up @@ -266,6 +266,9 @@ extension ${TraversalCollection} where Self : LazyCollectionProtocol {

% end

extension Slice: LazySequenceProtocol where Base: LazySequenceProtocol { }
extension Slice: LazyCollectionProtocol where Base: LazyCollectionProtocol { }

// ${'Local Variables'}:
// eval: (read-only-mode 1)
// End:
18 changes: 18 additions & 0 deletions test/stdlib/LazySlice.swift
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@@ -0,0 +1,18 @@
// RUN: rm -rf %t ; mkdir -p %t
// RUN: %target-build-swift %s -o %t/a.out3 -swift-version 3 && %target-run %t/a.out3
// REQUIRES: executable_test

import StdlibUnittest

var tests = TestSuite("LazySlice")

tests.test("CommuteLazyness") {
let a = [1,2,3].lazy
let b = a[...]
var c = b.filter { $0 == 0 }
// NOTE, this test will fail once lazy collectionness becomes a conditiona
// conformance, and will need updating to be a LazyBidirectional thingy
expectType(LazyFilterBidirectionalCollection<Slice<LazyRandomAccessCollection<[Int]>>>.self, &c)
}

runAllTests()