[Concurrency] Workaround for _runAsyncHandler.

DougGregor · DougGregor · commit 5cac8d015267 · 2020-12-16T19:37:50.000-08:00
Work around an expected miscompile in _runAsyncHandler.
diff --git a/stdlib/public/Concurrency/Task.swift b/stdlib/public/Concurrency/Task.swift
@@ -314,6 +314,7 @@ extension Task {
 
 }
 
+@_optimize(none)
 public func _runAsyncHandler(operation: @escaping () async -> ()) {
   _ = Task.runDetached(operation: operation)
 }

Original file line number	Diff line number	Diff line change
`@@ -314,6 +314,7 @@ extension Task {`
`314`	`314`
`315`	`315`	`}`
`316`	`316`
	`317`	`+@_optimize(none)`
`317`	`318`	`public func _runAsyncHandler(operation: @escaping () async -> ()) {`
`318`	`319`	`_ = Task.runDetached(operation: operation)`
`319`	`320`	`}`