Transfer: Changed transfer program file extension from .tr to .tra to avoid collision with Troff file extension.

transfer/examples/exp.tra

@@ -0,0 +1,33 @@
+import prelude
+
+data Cat : Type where
+  Stm : Cat
+  Exp : Cat
+  Var : Cat
+  Typ : Cat
+  ListStm : Cat
+
+data Tree : Cat -> Type where
+  SDecl   : Tree Typ -> Tree Var -> Tree Stm
+  SAss    : Tree Var -> Tree Exp -> Tree Stm
+  SBlock  : Tree ListStm -> Tree Stm
+  EAdd    : Tree Exp -> Tree Exp -> Tree Exp
+  EStm    : Tree Stm -> Tree Exp
+  EVar    : Tree Var -> Tree Exp
+  EInt    : Integer -> Tree Exp
+  V       : String -> Tree Var
+  TInt    : Tree Typ
+  TFloat  : Tree Typ
+
+  NilStm  : Tree ListStm
+  ConsStm : Tree Stm -> Tree ListStm -> Tree ListStm
+
+derive Compos Tree
+
+rename : (String -> String) -> (C : Type) -> Tree C -> Tree C
+rename f C t = case t of
+		   V x -> V (f x)
+		   _ -> composOp ? ? compos_Tree C (rename f) t
+
+
+main = rename (const ? ? "apa") Stm (SAss (V "y") (EAdd (EVar (V "x")) (EInt 2)))