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Closing over the checkPackageHandle creates a cycle that forces the checkPackageHandle not to be garbage collected until the value is created. If a value is never created, the handle will not be collected. Change-Id: I0f94557da917330ebe307a0e843b16ca7382e210 Reviewed-on: https://go-review.googlesource.com/c/tools/+/204079 Run-TryBot: Rebecca Stambler <rstambler@golang.org> Reviewed-by: Ian Cottrell <iancottrell@google.com>