We need to name the different types of curly-infix formats, so we can talk
about them. Proposed names:
* Empty: {} maps to (), because it's an empty list.
* Escaping: {e} maps to e, because it "escapes" symbol e.
* Unary: {op e} maps to (op e), for any "op" and "e", because it lets you do {-
x} and similar.
* Simple: {e1 op e2 op ...} maps to (even-parameter odd-parameters), this lets
you do simple infix.
* Mixed: The rest, it has different operators mixed together.
The [Solutions] text could then say,
"The empty {} maps to (), the escaping {e} maps to e, and the unary {op e} maps
to (op e)."
Thus, {x + y + z} is a simple curly-infix list, while {- q} is a unary
curly-infix list.
Then we need to rename function "transform-not-simple-infix" to
"transform-mixed-curly-infix".
It is really amazing how nicely this approach works, especially with
neoteric-expressions.
--- David A. Wheeler
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