Allow nested assignments in type guards
Allow nested assignments in type guards

Eyas/TypeScript,donaldpipowitch/TypeScript,minestarks/TypeScript,basarat/TypeScript,chuckjaz/TypeScript,vilic/TypeScript,Eyas/TypeScript,kitsonk/TypeScript,RyanCavanaugh/TypeScript,SaschaNaz/TypeScript,nojvek/TypeScript,synaptek/TypeScript,thr0w/Thr0wScript,kpreisser/TypeScript,jeremyepling/TypeScript,basarat/TypeScript,synaptek/TypeScript,Eyas/TypeScript,jwbay/TypeScript,vilic/TypeScript,minestarks/TypeScript,mihailik/TypeScript,DLehenbauer/TypeScript,TukekeSoft/TypeScript,erikmcc/TypeScript,vilic/TypeScript,mihailik/TypeScript,kpreisser/TypeScript,SaschaNaz/TypeScript,Microsoft/TypeScript,weswigham/TypeScript,weswigham/TypeScript,microsoft/TypeScript,jwbay/TypeScript,mihailik/TypeScript,jwbay/TypeScript,mihailik/TypeScript,SaschaNaz/TypeScript,nojvek/TypeScript,nojvek/TypeScript,DLehenbauer/TypeScript,Eyas/TypeScript,basarat/TypeScript,thr0w/Thr0wScript,thr0w/Thr0wScript,RyanCavanaugh/TypeScript,kitsonk/TypeScript,minestarks/TypeScript,jeremyepling/TypeScript,erikmcc/TypeScript,Microsoft/TypeScript,kitsonk/TypeScript,donaldpipowitch/TypeScript,TukekeSoft/TypeScript,donaldpipowitch/TypeScript,chuckjaz/TypeScript,synaptek/TypeScript,erikmcc/TypeScript,erikmcc/TypeScript,jeremyepling/TypeScript,jwbay/TypeScript,chuckjaz/TypeScript,vilic/TypeScript,kpreisser/TypeScript,TukekeSoft/TypeScript,microsoft/TypeScript,basarat/TypeScript,thr0w/Thr0wScript,donaldpipowitch/TypeScript,alexeagle/TypeScript,microsoft/TypeScript,alexeagle/TypeScript,DLehenbauer/TypeScript,DLehenbauer/TypeScript,RyanCavanaugh/TypeScript,alexeagle/TypeScript,chuckjaz/TypeScript,nojvek/TypeScript,SaschaNaz/TypeScript,Microsoft/TypeScript,synaptek/TypeScript,weswigham/TypeScript