==== tests/cases/compiler/binaryArithmatic3.ts (2 errors) ====
    var v = undefined | undefined;
            ~~~~~~~~~
!!! The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
                        ~~~~~~~~~
!!! The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.