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Daniel Theophanes authored
Previously driver.Stmt could could be closed multiple times in edge cases that drivers may not test for initially. Make their job easier by ensuring the driver is only closed a single time. Fixes #16019 Change-Id: I1e4777ef70697a849602e6ef9da73054a8feb4cd Reviewed-on: https://go-review.googlesource.com/33352Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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