3.5 Function Calls
| (id expr expr ...) |
A function call in Intermediate is the same as a Beginning
function call, except that it can also call
locally defined functions or functions passed as
arguments. That is, id can be a function defined in
local or an argument name while in a function.
| (#%app id expr expr ...) |
A function call can be written with #%app, though it’s
practically never written that way.