[Bug-apl] Defining APL functions with [ ]

[Blake McBride]

Greetings,

APL-1 did not allow functions to be defined with [ and ] in the header.
 I've seen it done in GNU APL as follows:

      ∇fun[⎕]∇
    ∇
[0]   fun[x]y
[1]   x
[2]   y
    ∇

      fun[4]55
4
55

I understand what is going on, but I was looking for it in the APL-2
manuals.  I couldn't find it in any of the IBM manuals (and the spec is
unreadable to me).  So, my question is, where in the IBM APL-2 Language
Manual is it shown?  Any place else?

Thanks.

Blake