[sledge] Remove some fragile patterns
[sledge] Remove some fragile patterns

Reviewed By: ngorogiannis

Differential Revision: D19221867

fbshipit-source-id: 1dcd734e6

facebook/infer,jvillard/infer,facebook/infer,facebook/infer,facebook/infer,jvillard/infer,facebook/infer,facebook/infer,facebook/infer,jvillard/infer,jvillard/infer,jvillard/infer,jvillard/infer,jvillard/infer