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076cbcdb71
Under certain conditions upgrades on Windows may fail because `wp_tempnam()` gets called in a loop. This can happen when `wp_tempnam()` is called with `\.maintenance` for the `$filename` parameter. The function strips the extension, in this case `.maintenance`, which results in an empty filename. Because it's empty, `wp_tempnam()` calls itself with `dirname( '\.maintenance' )`. On *nix systems this would be `"/"` which allows `wp_tempnam()` to fall back on `time()`. But on Windows it's `"\"`. This change adds the backslash to the list of characters which allow `wp_tempnam()` to fall back on `time()`. See [32322], [31936]. Fixes #33999. git-svn-id: https://develop.svn.wordpress.org/trunk@38151 602fd350-edb4-49c9-b593-d223f7449a82