# Pack
\x -> (:x)              # Function returning tuple (x: x)
\t -> (:t.*, x: t.x+1)  # Function returning tuple with all t attributes, but new x

# Unpack
\(:x) -> x              # = \t -> t.x
\(:*) -> x + y          # = \t -> t.x + t.y

# Transform (t already bound)
\t=(:x) -> x            # = t.x
\t=(:*) -> x + y        # = t.x + t.y

# "//" denotes a package reference.
//.                                     # Standard library as tuple
//.math                                 # Standard math library as tuple
//.math.sin                             # Standard math library sin function

//.math.sin(x)
# Other ways to compute sin x...
\//.=(:math) -> math.sin(x)             # Unpack math from standard library.
\//.math=(:sin) -> sin(x)               # Unpack sin from math.
# ...and beyond...
\//.math=(:*) -> sin(x)**2 + cos(x)**2  # Unpack everything from math.

# After "//" (except "//."), "/" means "." until the first "." after the first "/".
# This allows package paths to be used as follows:
//github.com/nlp/languages.english.parse("The rain in spain falls mainly on the plain.")

\primes = //oeis.org/A000040
\sq_primes = primes >> .**2
...

# //github.com/nlp/languages.english.parse(...)
//.fs("https://github.com/nlp/languages").english.parse(...)

\oeis = //.fs("https://github.com/oeis/arrai")
\raw = //.fs("https://oeis.org/search?q=id:A000040&fmt=text") ->
    oeis.parse(raw).STU