                     return
             }
             
-            XCTAssertTrue(_testIntegerLiteral(right, tt.integerValue))
+            _testIntegerLiteral(right, tt.integerValue)
         }
     }
     

                    return
            }
            
            
            XCTAssertTrue(_testIntegerLiteral(exp.left, tt.leftValue))
            XCTAssertTrue(_testIntegerLiteral(right, tt.rightValue))
        }
    }
        

        XCTAssertEqual(literal.tokenLiteral, "5")
    }
    
    func _testIntegerLiteral(_ il: Expression, _ value: Int64) {
        guard
            let int = il as? IntegerLiteral
        else {
            XCTFail()
            return
        }
        
        XCTAssertEqual(int.value, value)
    }
    
    func testParsingPrefixExpressions() {
