Break the cycle between the task and the fiber as early as possible.

Author: ioquatix

lib/async/task.rb

@@ -456,6 +456,9 @@ def warn(...)
 
 		# Finish the current task, moving any children to the parent.
 		def finish!
+			# Break the cycle:
+			@fiber&.async_task = nil
+			
 			# Don't hold references to the fiber or block after the task has finished:
 			@fiber = nil
 			@block = nil # If some how we went directly from initialized to finished.

test/async/task.rb

@@ -85,6 +85,17 @@
 			expect(was_current).to be == true
 			expect(task).not.to be(:current?)
 		end
+		
+		it "clears async_task on fiber after task finishes" do
+			fiber = nil
+			
+			task = reactor.async do |task|
+				fiber = Fiber.current
+			end
+			
+			# After the task completes, the fiber should no longer reference the task:
+			expect(fiber.async_task).to be_nil
+		end
 	end
 
 	with "#async" do