checker: avoid useless closures
checker: avoid useless closures

donaldpipowitch/TypeScript,kitsonk/TypeScript,weswigham/TypeScript,weswigham/TypeScript,minestarks/TypeScript,minestarks/TypeScript,microsoft/TypeScript,nojvek/TypeScript,nojvek/TypeScript,RyanCavanaugh/TypeScript,basarat/TypeScript,microsoft/TypeScript,kitsonk/TypeScript,kpreisser/TypeScript,kpreisser/TypeScript,Microsoft/TypeScript,nojvek/TypeScript,SaschaNaz/TypeScript,nojvek/TypeScript,microsoft/TypeScript,SaschaNaz/TypeScript,basarat/TypeScript,basarat/TypeScript,alexeagle/TypeScript,alexeagle/TypeScript,donaldpipowitch/TypeScript,SaschaNaz/TypeScript,Microsoft/TypeScript,basarat/TypeScript,kpreisser/TypeScript,minestarks/TypeScript,donaldpipowitch/TypeScript,donaldpipowitch/TypeScript,SaschaNaz/TypeScript,weswigham/TypeScript,kitsonk/TypeScript,RyanCavanaugh/TypeScript,alexeagle/TypeScript,Microsoft/TypeScript,RyanCavanaugh/TypeScript