tests/cases/compiler/undefinedTypeAssignment4.ts(1,7): error TS2397: Declaration name conflicts with built-in global identifier 'undefined'.
tests/cases/compiler/undefinedTypeAssignment4.ts(4,11): error TS2397: Declaration name conflicts with built-in global identifier 'undefined'.
tests/cases/compiler/undefinedTypeAssignment4.ts(7,11): error TS2397: Declaration name conflicts with built-in global identifier 'undefined'.


==== tests/cases/compiler/undefinedTypeAssignment4.ts (3 errors) ====
    class undefined {
          ~~~~~~~~~
!!! error TS2397: Declaration name conflicts with built-in global identifier 'undefined'.
    	foo: string;
    }
    interface undefined {
              ~~~~~~~~~
!!! error TS2397: Declaration name conflicts with built-in global identifier 'undefined'.
    	member: number;
    }
    namespace undefined {
              ~~~~~~~~~
!!! error TS2397: Declaration name conflicts with built-in global identifier 'undefined'.
    	export var x = 42;
    }
    var x: undefined;
    var y: typeof undefined;
    