[comments in square brackets]

[preprocessor directives]
#INCLUDE 'math.halk';         [looks for a 'math' file in cwd, then ~/halk/include]
#INCLUDE 'io' AS '';          [bring everything in 'io' into global scope]


let.hello -> 'hello, ';       [variables must be given a value at declaration]

let.PI => math/PI;            [header namespaces are accessed with a '/']
                              [constants are denoted with a '=>']

fn.greeting.to -> {     ['fn' only expects 1 argument, so no grouping of arguments is necessary]
   let.message -> str.cat.(hello,to);  [parens can be used to make calls to multi-argument
                                       functions more clear]

   stdo.message;        [since 'io' was brought into global scope, we
                        don't need to (and, in fact, cannot) prefix it 
                        with a namespace]
};

fn.sum_all._ -> {       [variadic functions are possible with the reserved '_' argument,
                        which is treated as an array]
   return.foldl.+,0,_;  
};

fn.main -> {   [where our code will begin executing]
   greeting.[comments can be placed *anywhere*]"world.";
   exit.0;  [exit with code 0]
};