tests/cases/conformance/es6/Symbols/symbolType4.ts(2,1): error TS2356: An arithmetic operand must be of type 'any', 'number' or an enum type.
tests/cases/conformance/es6/Symbols/symbolType4.ts(3,1): error TS2356: An arithmetic operand must be of type 'any', 'number' or an enum type.


==== tests/cases/conformance/es6/Symbols/symbolType4.ts (2 errors) ====
    var s = Symbol.for("postfix");
    s++;
    ~
!!! error TS2356: An arithmetic operand must be of type 'any', 'number' or an enum type.
    s--;
    ~
!!! error TS2356: An arithmetic operand must be of type 'any', 'number' or an enum type.