[loose parser] Refine closing heuristic for expression lists
[loose parser] Refine closing heuristic for expression lists

Issue marijnh/tern#171

Skillupco/babel,marijnh/acorn,marcominetti/acorn-babel,marijnh/acorn,chicoxyzzy/babel,guybedford/babel,existentialism/babel,samwgoldman/babel,mathiasbynens/acorn,shuhei/babel,xiemaisi/acorn,vadzim/babel,samhou1988/acorn,hulkish/babel,luiseduardohdbackup/filbert,xiemaisi/acorn,differentmatt/filbert,TimothyGu/acorn,PolymerLabs/babel,btmills/acorn,TimothyGu/acorn,ternjs/acorn,TimothyGu/acorn,happibum/acorn,kittens/acorn-jsx,wcjohnson/babylon-lightscript,claudiopro/babel,kidaa/filbert,ternjs/acorn,maurobringolf/babel,kaicataldo/babel,happibum/acorn,thr0w/acorn-jsx,maurobringolf/babel,sebmck/acorn-jsx,hzoo/babel,mysticatea/acorn,hulkish/babel,claudiopro/babel,hzoo/babel,hulkish/babel,babel/babel,babel/babel,kidaa/filbert,cbishopvelti/babylon,guybedford/babel,kellyselden/babel,lightscript/babylon-lightscript,hulkish/babel,sebmck/acorn-jsx,jridgewell/babel,marcominetti/acorn-babel,RReverser/biscript,guybedford/babel,MarcelGerber/acorn,danez/babylon,Skillupco/babel,btmills/acorn,hzoo/babel,jridgewell/babel,btmills/acorn,jridgewell/babel,ajaxorg/acorn,babel/babel,Skillupco/babel,existentialism/babel,RReverser/acorn-jsx,gratex/acorn,gratex/acorn,shuhei/babel,mathiasbynens/acorn,Rich-Harris/acorn,samwgoldman/babel,samwgoldman/babel,claudiopro/babel,tonylukasavage/acorn,vadzim/babel,PolymerLabs/babel,kittens/acorn-jsx,CSNW/acorn,happibum/acorn,kaicataldo/babel,jridgewell/babel,chicoxyzzy/babel,Rich-Harris/acorn,marcominetti/acorn-babel,kaicataldo/babel,PolymerLabs/babel,babel/babylon,shuhei/babel,hzoo/babel,differentmatt/filbert,recipesjs/ingredients,mysticatea/acorn,ternjs/acorn,babel/babel,Rich-Harris/acorn,existentialism/babel,ajaxorg/acorn,Skillupco/babel,samhou1988/acorn,kaicataldo/babel,kellyselden/babel,kellyselden/babel,xiemaisi/acorn,mathiasbynens/acorn,maurobringolf/babel,chicoxyzzy/babel,MarcelGerber/acorn,gratex/acorn,mysticatea/acorn,kellyselden/babel,luiseduardohdbackup/filbert,marijnh/acorn,blai/acorn-jsx,MarcelGerber/acorn,chicoxyzzy/babel,ajaxorg/acorn