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The `try await` ordering is both easier to read and indicates the order of operations better, because the suspension point occurs first and then one can observe a thrown error.
45 lines
1.1 KiB
Swift
45 lines
1.1 KiB
Swift
// RUN: %target-run-simple-swift(-Xfrontend -enable-experimental-concurrency) | %FileCheck %s --dump-input always
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// REQUIRES: executable_test
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// REQUIRES: concurrency
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// REQUIRES: OS=macosx
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// REQUIRES: CPU=x86_64
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import Dispatch
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struct Boom: Error {}
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struct IgnoredBoom: Error {}
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func echo(_ i: Int) async -> Int { i }
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func boom() async throws -> Int { throw Boom() }
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func test_taskGroup_throws_rethrows() async {
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do {
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let got = try await Task.withGroup(resultType: Int.self) { (group) async throws -> Int in
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await group.add { await echo(1) }
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await group.add { await echo(2) }
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await group.add { try await boom() }
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do {
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while let r = try await group.next() {
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print("next: \(r)")
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}
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} catch {
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print("error caught and rethrown in group: \(error)")
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throw error
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}
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fatalError("should have thrown")
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}
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print("got: \(got)")
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fatalError("Expected error to be thrown, but got: \(got)")
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} catch {
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print("rethrown: \(error)")
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}
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}
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// CHECK: error caught and rethrown in group: Boom()
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// CHECK: rethrown: Boom()
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runAsyncAndBlock(test_taskGroup_throws_rethrows)
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