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17 lines
663 B
Swift
17 lines
663 B
Swift
// This source file is part of the Swift.org open source project
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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// RUN: %target-swift-frontend %s -typecheck -verify
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// Test case submitted to project by https://github.com/tmu (Teemu Kurppa)
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// rdar://18175202
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func d<b: Sequence, e>(c : b) -> e? where Optional<e> == b.Iterator.Element {
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for mx : e? in c { // expected-warning {{immutable value 'mx' was never used}}
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}
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}
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