diff -r 7f5a4cd08209 -r 608483c2122a src/HOL/MiniML/W.thy
--- a/src/HOL/MiniML/W.thy	Mon Feb 05 21:27:16 1996 +0100
+++ b/src/HOL/MiniML/W.thy	Mon Feb 05 21:29:06 1996 +0100
@@ -13,16 +13,16 @@
 
 (* type inference algorithm W *)
 consts
-	W :: [expr, typ list, nat] => result_W
+        W :: [expr, typ list, nat] => result_W
 
 primrec W expr
-  W_Var	"W (Var i) a n = (if i < length a then Ok(id_subst, nth i a, n)
-		          else Fail)"
-  W_Abs	"W (Abs e) a n = ( (s,t,m) := W e ((TVar n)#a) (Suc n);
-		           Ok(s, (s n) -> t, m) )"
-  W_App	"W (App e1 e2) a n =
- 		 ( (s1,t1,m1) := W e1 a n;
-		   (s2,t2,m2) := W e2 ($s1 a) m1;
-		   u := mgu ($s2 t1) (t2 -> (TVar m2));
-		   Ok( $u o $s2 o s1, $u (TVar m2), Suc m2) )"
+  W_Var "W (Var i) a n = (if i < length a then Ok(id_subst, nth i a, n)
+                          else Fail)"
+  W_Abs "W (Abs e) a n = ( (s,t,m) := W e ((TVar n)#a) (Suc n);
+                           Ok(s, (s n) -> t, m) )"
+  W_App "W (App e1 e2) a n =
+                 ( (s1,t1,m1) := W e1 a n;
+                   (s2,t2,m2) := W e2 ($s1 a) m1;
+                   u := mgu ($s2 t1) (t2 -> (TVar m2));
+                   Ok( $u o $s2 o s1, $u (TVar m2), Suc m2) )"
 end