[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]
                              [constants are denoted with a '=>']

let.  say_hello.to -> {
   let.greeting -> 
}