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derrickturk/ext.kk

Created July 29, 2022 02:06
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Extensible variant types (I think? they're not documented except in the grammar) in Koka
Raw
ext.kk
open type openvar
A
B
extend type openvar
C
fun do_it_try_it(v: openvar): console ()
match v
A -> println("got an A")
B -> println("got an B")
C -> println("got a C")
// worth nothing: we could match on D here, though
_ -> println("got something else")
extend type openvar
D
fun main(): console ()
do_it_try_it(C)
do_it_try_it(D)
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