[slang-users] Stack underflow()

[Bernd Eggink <bernd.eggink@xxxxxxxxxx>]

slsh> define f() {}
slsh> () = f();
Stack Underflow Error

I wonder why this is considered an error. If "()=" means "pop anything 
left on the stack", isn't "nothing" (in a mathematical sense) also 
"anything"?
This could be a problem IMHO if a function may or may not leave data on 
the stack, e.g. depending on parameter values. To prevent an error, one 
would have to wrap the call in a test of the stack width.

Or must the information about how many values a function leaves on the 
stack be understood as part of the contract with the user?

-Bernd

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