TODO

module-infix , module+ ?

{-4 sin(x) + x y ² - 5 x / y}

¹⁰

{ x ² + y ² + z ² }

a ² - 2 a b + b ²

note: ³ could be typed under linux with ^ 3
Using the text editor vim, one can produce subscripted and superscripted numbers by using the digraphs control-k-ns for subscription and control-k-nS for superscription, where n is an Arabic numeral.

list comme python [ elements ] -> ( elements ) if possible

#`(if (procedure? (car #,expr))
    #,expr
    (car ;  probably because the result will be encapsuled in a list !
	      (!*prec-generic-infix-parser #`expr operator-precedence creator)))