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7afe30ec7d
This commit adds a minimally working Slice type and minimal tests. Even though it might seem logical how the new protocol requirements are injected in the CollectionType hierarchy, it is very fragile and required many attempts to get the typechecker to finally accept it. Because I want to ensure that the type checker does not regress, I'm commiting a patch that does not do much yet. Swift SVN r27665
42 lines
2.3 KiB
Swift
42 lines
2.3 KiB
Swift
//===--- RangeDiagnostics.swift -------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2015 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 http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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// RUN: %target-parse-verify-swift
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func assertCollection<C: CollectionType>(_: C) {}
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assertCollection(0..<10)
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// The point of this test is to check that we don't allow indexing
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// Range<Int> et al with Int outside a generic context, to prevent the
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// problem that r[0] will be invalid when 0 is not contained int he
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// range.
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// Many of these error messages are terrible. If the test starts
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// failing because the error message improves, obviously, update the
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// test!
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let r0: Range = 10..<100
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let r1: Range = UInt(10)..<100
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let r2: Range = 10...100
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let r3: Range = UInt(10)...100
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r0[0] // expected-error {{cannot subscript a value of type 'Range<Int>' with an index of type 'Int'}}
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r1[UInt(0)] // expected-error {{cannot subscript a value of type 'Range<UInt>' with an index of type 'UInt'}}
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r1[0] // expected-error {{cannot subscript a value of type 'Range<UInt>' with an index of type 'Int'}}
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r2[0] // expected-error {{cannot subscript a value of type 'Range<Int>' with an index of type 'Int'}}
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r3[0] // expected-error {{cannot subscript a value of type 'Range<UInt>' with an index of type 'Int'}}
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r0[0..<4] // FIXME-error {{cannot subscript a value of type 'Range<Int>' with an index of type 'Range<Int>'}}
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r1[0..<4] // FIXME-error {{cannot subscript a value of type 'Range<UInt>' with an index of type 'Range<Int>'}}
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r2[0..<4] // FIXME-error {{cannot subscript a value of type 'Range<Int>' with an index of type 'Range<Int>'}}
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r3[0..<4] // FIXME-error {{cannot subscript a value of type 'Range<UInt>' with an index of type 'Range<Int>'}}
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(10..<100)[0] // expected-error {{cannot subscript a value of type '(Range<Int>)' with an index of type 'Int'}}
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(UInt(10)...100)[0..<4] // FIXME-error {{cannot subscript a value of type '(Range<UInt>)' with an index of type 'Range<Int>'}}
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