mirror of
https://github.com/idris-lang/Idris2.git
synced 2024-12-18 00:31:57 +03:00
a972778eab
They don't all pass yet, for minor reasons. Coming shortly... Unfortunately the startup overhead for chez is really noticeable here!
28 lines
779 B
Idris
28 lines
779 B
Idris
import Data.Vect
|
|
|
|
data Typ : Type where
|
|
TLam : Typ -> Typ -> Typ
|
|
TNat : Typ
|
|
|
|
data Term : Typ -> Vect len Typ -> Type where
|
|
Var : Elem a ctx -> Term a ctx
|
|
Lam : Term b (a :: ctx) -> Term (TLam a b) ctx
|
|
Fix : Term a (a :: ctx) -> Term a ctx
|
|
|
|
lookup : Vect len Typ -> Fin len -> Typ
|
|
lookup (a :: ctx) FZ = a
|
|
lookup (_ :: ctx) (FS n) = lookup ctx n
|
|
|
|
count : {ctx : Vect len Typ} -> (n : Fin len) -> Elem (lookup ctx n) ctx
|
|
count {ctx = _ :: ctx} FZ = Here
|
|
count {ctx = _ :: ctx} (FS n) = There (count n)
|
|
|
|
segfaults : {len : _} -> {ctx : Vect len Typ} ->
|
|
Term (TLam TNat TNat) ctx
|
|
segfaults = Fix (Lam (Var (count 0)))
|
|
|
|
cycleDetected : {len : _} -> {ctx : Vect len Typ} ->
|
|
Term (TLam TNat TNat) ctx
|
|
cycleDetected = Fix (Var (count 0))
|
|
|