Hi, If an ml file has the expression; "3 / 2". or for example: function divide(a, b) x <- a/b return x and then this is called as divide(3, 2). This will obviously be a problem when translated to C, as 3 and 2 will be treated as integers not doubles. Simply adding (double)("Expression") is also not suitable as there may be many operations in an expression. Can we assume that this will not occur, as part of the No invalid expressions condition provided by Chris? Or do we need to find a way to manage this.