Fix: Don't mutate lookaheads on merge
Fix: Don't mutate lookaheads on merge

DmitrySoshnikov/syntax,DmitrySoshnikov/syntax,DmitrySoshnikov/syntax,DmitrySoshnikov/syntax,DmitrySoshnikov/syntax,DmitrySoshnikov/syntax,DmitrySoshnikov/syntax,DmitrySoshnikov/syntax,DmitrySoshnikov/syntax