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af25b6764c
This involved adding a new substitution called %api_diff_data_dir that when building against a host toolchain, looks in the host toolchain (next to swiftc) rather than in the resource dir. The reason why I need to do this is this allows me to perform a stdlib stage2 build without needing to build swift itself. The only interesting changes here are that I had to add %api_diff_data_dir to a bunch of normal/expected tests and also add %api_diff_data_dir's length to the offsets in rdar31892850.swift.
113 lines
3.2 KiB
Plaintext
113 lines
3.2 KiB
Plaintext
// RUN: %empty-directory(%t)
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// RUN: %target-swift-frontend -c -swift-version 4 -primary-file %s -emit-migrated-file-path %t/optional_try_migration.result.swift %api_diff_data_dir
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// RUN: %diff -u %S/optional_try_migration.swift.expected %t/optional_try_migration.result.swift
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func fetchOptInt() throws -> Int? {
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return 3
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}
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func fetchInt() throws -> Int {
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return 3
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}
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func fetchAny() throws -> Any {
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return 3
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}
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func testOnlyMigrateChangedBehavior() {
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// No migration needed
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let _ = try? fetchInt()
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// Migration needed
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let _ = ((try? fetchOptInt()) as Int??)
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}
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func testExplicitCasts() {
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// No migration needed, because there's an explicit cast on the try already
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let _ = (try? fetchOptInt()) as? Int
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// Migration needed; the 'as? Int' is part of the sub-expression
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let _ = ((try? fetchAny() as? Int) as Int??)
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// No migration needed; the subexpression is non-optional so behavior has not changed
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let _ = (try? fetchAny()) as? Int
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// No migration needed, because there's an explicit cast on the try already
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let _ = (try? fetchOptInt()) as! Int // expected-warning {{forced cast from 'Int??' to 'Int' only unwraps optionals; did you mean to use '!!'?}}
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// No migration needed; the subexpression is non-optional
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let _ = try? fetchAny() as! Int
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// No migration needed; the subexpression is non-optional so behavior has not changed
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let _ = (try? fetchAny()) as! Int
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// Migration needed; the explicit cast is not directly on the try?
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let _ = String(describing: ((try? fetchOptInt()) as Int??)) as Any
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// No migration needed, because the try's subexpression is non-optional
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let _ = String(describing: try? fetchInt()) as Any
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}
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func testOptionalChaining() {
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struct Thing {
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func fetchInt() throws -> Int { return 3 }
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func fetchOptInt() throws -> Int { return 3 }
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}
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let thing = Thing()
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let optThing: Thing? = Thing()
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// Migration needed
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let _ = ((try? optThing?.fetchInt()) as Int??)
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// Migration needed
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let _ = ((try? optThing?.fetchOptInt()) as Int??)
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// No migration needed
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let _ = try? optThing!.fetchOptInt()
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// No migration needed, because of the explicit cast
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let _ = (try? optThing?.fetchOptInt()) as? Int // expected-warning{{conditional downcast from 'Int?' to 'Int' does nothing}}
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// Migration needed
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let _ = try? thing.fetchInt()
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// Migration needed
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let _ = try? thing.fetchOptInt()
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// No migration needed, because of the explicit cast
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let _ = (try? thing.fetchOptInt()) as! Int // expected-warning {{forced cast from 'Int?' to 'Int' only unwraps optionals; did you mean to use '!'?}}
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}
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func testIfLet() {
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// Migration needed
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if let optionalX = ((try? fetchOptInt()) as Int??),
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let x = optionalX
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{
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print(x)
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}
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// Don't change 'try?'s that haven't changed behavior
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if let x = try? fetchInt(),
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let y = try? fetchInt() {
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print(x, y)
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}
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}
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func testCaseMatching() {
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// Migration needed
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if case let x?? = ((try? fetchOptInt()) as Int??) {
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print(x)
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}
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// No migration needed
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if case let x? = try? fetchInt() {
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print(x)
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}
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}
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