Handling function arguments without macros.

I'm making a language that compiles to mcfunction files and I can't find a way to perfectly implement function arguments without using function macros. What I've tried so far is just defining the argument as a unique non-accessable variable name so that you can't access it out of the function. But this breaks when you call the function itself inside the function. Here's an example: js function test(a) { if (a == 2) return // Doesn't matter what it does when a=2, the point is that a=2 is executed. test(2) // since this uses the same `a` variable it will alter the value of `a`, making a = 2 return a // returns 2 instead of 1 } test(1) // returns 2 instead of 1 Is it possible to convert this code into mcfunction files?