string - or function

[#1]

In a code, the coding for the expression handling was wrong and produced a surprising result.

I reduced it to an interaction between "x()" [inside Variables (x(:column))] and a variable x.

an example:

x= "hello";
type(x); // -> string
X(5) // -> "hello"

After defining a variable x, I can use it as a function x(...) - with an arbitrary argument
...  and JMP will return the content of x.

somehow the inverse of 

col << rerun formula;
// short for 
col << rerun formula();

https://www.jmp.com/support/help/en/17.1/?os=win&source=application#page/jmp/rules-for-resolving-nam...