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This makes diagnostics more verbose and accurate, because it's possible to distinguish how many parameters there are based on the message itself. Also there are multiple diagnostic messages in a format of `<descriptive-kind> <decl-name> ...` that get printed as e.g. `subscript 'subscript'` if empty labels are omitted.
84 lines
5.5 KiB
Swift
84 lines
5.5 KiB
Swift
// RUN: %target-typecheck-verify-swift
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// XFAIL: linux
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import Foundation
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// Common pitfall: trying to subscript a string with integers.
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func testIntSubscripting(s: String, i: Int) {
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// FIXME swift-3-indexing-model: test new overloads of ..<, ...
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_ = s[i] // expected-error{{'subscript(_:)' is unavailable: cannot subscript String with an Int, see the documentation comment for discussion}}
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_ = s[17] // expected-error{{'subscript(_:)' is unavailable: cannot subscript String with an Int, see the documentation comment for discussion}}
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_ = s[i...i] // expected-error{{'subscript(_:)' is unavailable: cannot subscript String with an integer range, see the documentation comment for discussion}}
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_ = s[17..<20] // expected-error{{'subscript(_:)' is unavailable: cannot subscript String with an integer range, see the documentation comment for discussion}}
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_ = s[17...20] // expected-error{{'subscript(_:)' is unavailable: cannot subscript String with an integer range, see the documentation comment for discussion}}
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_ = s[Range(i...i)] // expected-error{{'subscript(_:)' is unavailable: cannot subscript String with an integer range, see the documentation comment for discussion}}
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_ = s[Range(17..<20)] // expected-error{{'subscript(_:)' is unavailable: cannot subscript String with an integer range, see the documentation comment for discussion}}
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_ = s[Range(17...20)] // expected-error{{'subscript(_:)' is unavailable: cannot subscript String with an integer range, see the documentation comment for discussion}}
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_ = s[Range(i...i)] // expected-error{{'subscript(_:)' is unavailable: cannot subscript String with an integer range, see the documentation comment for discussion}}
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_ = s[Range(17..<20)] // expected-error{{'subscript(_:)' is unavailable: cannot subscript String with an integer range, see the documentation comment for discussion}}
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_ = s[Range(17...20)] // expected-error{{'subscript(_:)' is unavailable: cannot subscript String with an integer range, see the documentation comment for discussion}}
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}
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func testNonAmbiguousStringComparisons() {
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let s1 = "a"
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let s2 = "b"
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var x = false // expected-warning {{variable 'x' was written to, but never read}}
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x = s1 > s2
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x = s1 as String > s2
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}
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func testAmbiguousStringComparisons(s: String) {
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let nsString = s as NSString
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let a1 = s as NSString == nsString
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let a2 = s as NSString != nsString
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let a3 = s < nsString // expected-error{{'NSString' is not implicitly convertible to 'String'; did you mean to use 'as' to explicitly convert?}} {{24-24= as String}}
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let a4 = s <= nsString // expected-error{{'NSString' is not implicitly convertible to 'String'; did you mean to use 'as' to explicitly convert?}} {{25-25= as String}}
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let a5 = s >= nsString // expected-error{{'NSString' is not implicitly convertible to 'String'; did you mean to use 'as' to explicitly convert?}} {{25-25= as String}}
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let a6 = s > nsString // expected-error{{'NSString' is not implicitly convertible to 'String'; did you mean to use 'as' to explicitly convert?}} {{24-24= as String}}
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// now the other way
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let a7 = nsString == s as NSString
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let a8 = nsString != s as NSString
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let a9 = nsString < s // expected-error{{'NSString' is not implicitly convertible to 'String'; did you mean to use 'as' to explicitly convert?}} {{20-20= as String}}
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let a10 = nsString <= s // expected-error{{'NSString' is not implicitly convertible to 'String'; did you mean to use 'as' to explicitly convert?}} {{21-21= as String}}
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let a11 = nsString >= s // expected-error{{'NSString' is not implicitly convertible to 'String'; did you mean to use 'as' to explicitly convert?}} {{21-21= as String}}
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let a12 = nsString > s // expected-error{{'NSString' is not implicitly convertible to 'String'; did you mean to use 'as' to explicitly convert?}} {{21-21= as String}}
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// Shouldn't suggest 'as' in a pattern-matching context, as opposed to all these other situations
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if case nsString = "" {} // expected-error{{expression pattern of type 'NSString' cannot match values of type 'String'}}
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}
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func testStringDeprecation(hello: String) {
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let hello2 = hello
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.addingPercentEscapes(using: .utf8) // expected-error{{'addingPercentEscapes(using:)' is unavailable}}
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_ = hello2?
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.replacingPercentEscapes(using: .utf8) // expected-error{{'replacingPercentEscapes(using:)' is unavailable}}
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}
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// Positive and negative tests for String collection types. Testing the complete
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// set of conformance just in case protocol hierarchy changes.
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func acceptsCollection<C: Collection>(_: C) {}
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func acceptsBidirectionalCollection<C: BidirectionalCollection>(_: C) {}
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func acceptsRandomAccessCollection<C: RandomAccessCollection>(_: C) {}
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func testStringCollectionTypes(s: String) {
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acceptsCollection(s.utf8)
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acceptsBidirectionalCollection(s.utf8)
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acceptsRandomAccessCollection(s.utf8) // expected-error{{argument type 'String.UTF8View' does not conform to expected type 'RandomAccessCollection'}}
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acceptsCollection(s.utf16)
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acceptsBidirectionalCollection(s.utf16)
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acceptsRandomAccessCollection(s.utf16) // expected-error{{argument type 'String.UTF16View' does not conform to expected type 'RandomAccessCollection'}}
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acceptsCollection(s.unicodeScalars)
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acceptsBidirectionalCollection(s.unicodeScalars)
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acceptsRandomAccessCollection(s.unicodeScalars) // expected-error{{argument type 'String.UnicodeScalarView' does not conform to expected type 'RandomAccessCollection'}}
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acceptsCollection(s)
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acceptsBidirectionalCollection(s)
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acceptsRandomAccessCollection(s) // expected-error{{argument type 'String' does not conform to expected type 'RandomAccessCollection'}}
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}
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