annotate demo/tcSum.ur @ 623:588b9d16b00a

Start of kind polymorphism, up to the point where demo/hello elaborates with updated Basis/Top
author Adam Chlipala <adamc@hcoop.net>
date Sun, 22 Feb 2009 16:10:25 -0500
parents e0e9e9eca1cb
children 6c4643880df5
rev   line source
adamc@417 1 fun sum (t ::: Type) (_ : num t) (fs ::: {Unit}) (x : $(mapUT t fs)) =
adamc@417 2 foldUR [t] [fn _ => t]
adamc@417 3 (fn (nm :: Name) (rest :: {Unit}) [[nm] ~ rest] n acc => n + acc)
adamc@417 4 zero [fs] x
adamc@417 5
adamc@417 6 fun main () = return <xml><body>
adamc@417 7 {[sum {A = 0, B = 1}]}<br/>
adamc@417 8 {[sum {C = 2.1, D = 3.2, E = 4.3}]}
adamc@417 9 </body></xml>