Fix a typo in Parser.ParseIt
Fix a typo in Parser.ParseIt

CC: da39a3ee5e6b4b0d3255bfef95601890afd80709@beurdouche

A-Manning/FStar,FStarLang/FStar,A-Manning/FStar,FStarLang/FStar,A-Manning/FStar,FStarLang/FStar