--- a/src/HOL/W0/Maybe.ML Mon Jun 22 17:13:09 1998 +0200
+++ b/src/HOL/W0/Maybe.ML Mon Jun 22 17:26:46 1998 +0200
@@ -6,25 +6,25 @@
(* constructor laws for bind *)
-goalw thy [bind_def] "(Ok s) bind f = (f s)";
+Goalw [bind_def] "(Ok s) bind f = (f s)";
by (Simp_tac 1);
qed "bind_Ok";
-goalw thy [bind_def] "Fail bind f = Fail";
+Goalw [bind_def] "Fail bind f = Fail";
by (Simp_tac 1);
qed "bind_Fail";
Addsimps [bind_Ok,bind_Fail];
(* case splitting of bind *)
-goal thy
+Goal
"P(res bind f) = ((res = Fail --> P Fail) & (!s. res = Ok s --> P(f s)))";
by (induct_tac "res" 1);
by (fast_tac (HOL_cs addss simpset()) 1);
by (Asm_simp_tac 1);
qed "split_bind";
-goal Maybe.thy
+Goal
"((m bind f) = Fail) = ((m=Fail) | (? p. m = Ok p & f p = Fail))";
by (simp_tac (simpset() addsplits [split_bind]) 1);
qed "bind_eq_Fail";