Fix type inference regression
Fix type inference regression

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