use (cpp.ref) instead of (cpp.ref = "...")
use (cpp.ref) instead of (cpp.ref = "...")

Reviewed By: yfeldblum

Differential Revision: D25519171

fbshipit-source-id: 4e7ce19f43fa8e09624d17d1ff87589280577020

facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift