[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

nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow