Re: [Bug-apl] Execute gives incorrect VALUE ERROR

[David B. Lamkins]

This is ambibiguous w.r.t. the two spec on which GNU APL is based.

Page 120 of the IBM Reference Manual says:

"Valueless Expression: If R is empty or represents a defined function or
operator without explicit result, R has no value."

Page 135 of the ISO Spec says:

"Informal Description: Z is the result of evaluating the character
scalar or vector B as a line of APL."


So the IBM spec allows an expression which doesn't return a value; the
ISO spec doesn't.

Personally, I find the IBM definition to be more accommodating of the
behaviors I'd like to see.



On Fri, 2014-05-23 at 15:24 -0500, Blake McBride wrote:
>       )CLEAR
> CLEAR WS
>       ∇fun
> [1] 'in fun'
> [2] ∇
>       ⍎'fun'
> in fun
> VALUE ERROR
>       fun
>       ^
>