Fix inference to indexed access type containing substitution type
Fix inference to indexed access type containing substitution type

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