`err` variable shared throughout the NewServer function and used on line
396 to defer decision whether backend should be closed when starting
the server failed.
`snapshot` variable is first defined 407, redeclared locally on line 496 and later
again used on line 625. Creation of local variable is a bug introduced
in https://github.com/etcd-io/etcd/pull/11888.
Signed-off-by: Marek Siarkowicz <siarkowicz@google.com>
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