Signal Keywords

module <identifier>
include <string>
let <identifier> <- <expression>

if <expression> { <expression> }
elif <expression> { <expression> }
else { <expression> }

match <expression> { <pattern> ==> <expression>, ... }

struct { <identifier>, ... }
enum flag? { <identifier>, ... }
file read/write? <string>

delay <integer>
delay <integer>, <integer>

map <function>
filter <function>
fold <function>