Fix broken build due to "missing braces around initializer" error
Fix broken build due to "missing braces around initializer" error

Summary: Fix broken build due to "missing braces around initializer" error

Reviewed By: nbronson

Differential Revision: D8541080

fbshipit-source-id: f73f973c575b6d3dad999a454d1306f7608122c7

facebook/folly,facebook/folly,facebook/folly,facebook/folly,facebook/folly