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authorGravatar Adam Chlipala <adamc@hcoop.net>2008-09-11 19:59:31 -0400
committerGravatar Adam Chlipala <adamc@hcoop.net>2008-09-11 19:59:31 -0400
commita12b7d5677662153dd69c14945c0d88f447425a3 (patch)
tree6a16a83ce73b7c035f67e6d51c982e3bf79115ad /lib
parenta1c9eb584060bb6fac219f53540324777a7fa5b4 (diff)
Fixed a mind-numbing De Bruijn bug
Diffstat (limited to 'lib')
-rw-r--r--lib/top.ur10
1 files changed, 10 insertions, 0 deletions
diff --git a/lib/top.ur b/lib/top.ur
index 16d2ed42..ec0e58af 100644
--- a/lib/top.ur
+++ b/lib/top.ur
@@ -4,3 +4,13 @@ con mapTT (f :: Type -> Type) = fold (fn nm t acc => [nm] ~ acc =>
fun compose (t1 ::: Type) (t2 ::: Type) (t3 ::: Type) (f1 : t2 -> t3) (f2 : t1 -> t2) (x : t1) = f1 (f2 x)
fun txt (t ::: Type) (ctx ::: {Unit}) (use ::: {Type}) (sh : show t) (v : t) = cdata (show sh v)
+
+fun foldTR2 (tf1 :: Type -> Type) (tf2 :: Type -> Type) (tr :: {Type} -> Type)
+ (f : nm :: Name -> t :: Type -> rest :: {Type} -> [nm] ~ rest
+ -> tf1 t -> tf2 t -> tr rest -> tr ([nm = t] ++ rest))
+ (i : tr []) =
+ fold [fn r :: {Type} => $(mapTT tf1 r) -> $(mapTT tf2 r) -> tr r]
+ (fn (nm :: Name) (t :: Type) (rest :: {Type}) (acc : _ -> _ -> tr rest) =>
+ [[nm] ~ rest] =>
+ fn r1 r2 => f [nm] [t] [rest] r1.nm r2.nm (acc (r1 -- nm) (r2 -- nm)))
+ (fn _ _ => i)