/prog/BOL 2012

identity is of type for all types A, A to A.
define function identity of x:
   return x.
end.

constant is of type for all types A and B, A to B to A.
define function constant of x of y:
   return x.
end.

define factorial of type int to int of n:
   if n equals 0, then: return 1.
   else: return n times factorial of (n minus 1).
end.

>>23
define foo of type int and float to float of a and b:
   return 2 times b plus a.
end
Maybe integer and binary could be integer types and real and computational could be floating-point types to make it more COBOL like. I think as 'type' would be a good syntax for casts, like b as integer.