test: fix flaky test for issue24491
runtime.GC() doesn't guarantee the finalizer has run, so use a channel instead to make sure finalizer was run in call to "after()". Fixes #41361 Change-Id: I69c801e29aea49757ea72c52e8db13239de19ddc Reviewed-on: https://go-review.googlesource.com/c/go/+/254401 Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Matthew Dempsky <mdempsky@google.com> Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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