Designing a Programming Language to Speedrun Advent of Code

I would have liked to see a nice clear example at the top to help me decide if I really want to read about the language.

EDIT: First sample:

    
day := 1;
import "advent-prelude.noul";

puzzle_input := advent_input();

submit! 1, puzzle_input split "\n\n" map ints map sum then max;
submit! 2, puzzle_input split "\n\n" map ints map sum then sort then (_[-3:]) then sum;

Looks not too different from what you might do in Factor:

    
: totals ( -- seq )
  puzzle-input "\n\n" split-subseq [ split-lines [ string>number ] map-sum ] map
;

: part1 ( -- ) totals supremum . ;

: part2 ( -- ) totals sort 3 tail* sum . ;