tests/cases/conformance/expressions/unaryOperators/negateOperator/negateOperatorWithBooleanType.ts(33,1): error TS2695: Left side of comma operator is unused and has no side effects.


==== tests/cases/conformance/expressions/unaryOperators/negateOperator/negateOperatorWithBooleanType.ts (1 errors) ====
    // - operator on boolean type
    var BOOLEAN: boolean;
    
    function foo(): boolean { return true; }
    
    class A {
        public a: boolean;
        static foo() { return false; }
    }
    module M {
        export var n: boolean;
    }
    
    var objA = new A();
    
    // boolean type var
    var ResultIsNumber1 = -BOOLEAN;
    
    // boolean type literal
    var ResultIsNumber2 = -true;
    var ResultIsNumber3 = -{ x: true, y: false };
    
    // boolean type expressions
    var ResultIsNumber4 = -objA.a;
    var ResultIsNumber5 = -M.n;
    var ResultIsNumber6 = -foo();
    var ResultIsNumber7 = -A.foo();
    
    // miss assignment operators
    -true;
    -BOOLEAN;
    -foo();
    -true, false;
    ~~~~~
!!! error TS2695: Left side of comma operator is unused and has no side effects.
    -objA.a;
    -M.n;