==== tests/cases/compiler/cloduleSplitAcrossFiles_class.ts (0 errors) ====
    class D { }
    
==== tests/cases/compiler/cloduleSplitAcrossFiles_module.ts (1 errors) ====
    module D {
           ~
!!! A module declaration cannot be in a different file from a class or function with which it is merged
        export var y = "hi";
    }
    D.y;