Fix allocated-then-discarded node in loose parser
Fix allocated-then-discarded node in loose parser

Closes #395

mysticatea/acorn,ternjs/acorn,TimothyGu/acorn,TimothyGu/acorn,marijnh/acorn,TimothyGu/acorn,marijnh/acorn,mysticatea/acorn,marijnh/acorn,ternjs/acorn,mysticatea/acorn,ternjs/acorn