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Array module (runtime.sx, OCaml syntax):
Backed by a 'ref of list'. make/length/get/init build the cell;
set rewrites the underlying list with one cell changed (O(n) but
works for short arrays in baseline programs). Includes
iter/iteri/map/mapi/fold_left/to_list/of_list/copy/blit/fill.
(op) operator sections (parser.sx, parse-atom):
When the token after '(' is a binop (any op with non-zero
precedence in the binop table) and the next token is ')', emit
(:fun ('a' 'b') (:op OP a b)) — i.e. (+) becomes fun a b -> a + b.
Recognises every binop including 'mod', 'land', '^', '@', '::',
etc.
Lets us write:
List.fold_left (+) 0 [1;2;3;4;5] = 15
let f = ( * ) in f 6 7 = 42
List.map ((-) 10) [1;2;3] = [9;8;7]
let a = Array.make 5 7 in
Array.set a 2 99;
Array.fold_left (+) 0 a = 127