[PR] fix parser test build
[PR] fix parser test build

Summary:
Fixes https://github.com/facebook/flow/issues/7899
Pull Request resolved: https://github.com/facebook/flow/pull/7907

Differential Revision: D16149455

Pulled By: mroch

fbshipit-source-id: 09d738307faec29901d9e54338b3a58ce295d36f

mroch/flow,facebook/flow,gabelevi/flow,mroch/flow,gabelevi/flow,facebook/flow,samwgoldman/flow,gabelevi/flow,gabelevi/flow,mroch/flow,facebook/flow,facebook/flow,facebook/flow,facebook/flow,mroch/flow,mroch/flow,samwgoldman/flow,facebook/flow,samwgoldman/flow,mroch/flow,samwgoldman/flow,samwgoldman/flow,samwgoldman/flow,samwgoldman/flow,gabelevi/flow,mroch/flow,gabelevi/flow,gabelevi/flow