Microsoft/TypeScript — pull request #681 by JsonFreeman (2014-09-16 22:20:44+00:00)
Title: Switch to createCompilerDiagnostic for an invalid root file

Instead of reporting a file diagnostic when the user specifies a nonexistent file on the command line, we need to report a compiler diagnostic. This was found by the start/length assert in createFileDiagnostic, which was causing the compiler to crash. I think we should take this for release-1.1.