isabelle: src/HOL/MiniML/W.thy@f7feaacd33d3 (annotated)

1300 c7a8f374339b New theory: type inference for let-free MiniML nipkow parents: diff changeset	1	(* Title: HOL/MiniML/W.thy
c7a8f374339b New theory: type inference for let-free MiniML nipkow parents: diff changeset	2	ID: $Id$
c7a8f374339b New theory: type inference for let-free MiniML nipkow parents: diff changeset	3	Author: Dieter Nazareth and Tobias Nipkow
c7a8f374339b New theory: type inference for let-free MiniML nipkow parents: diff changeset	4	Copyright 1995 TU Muenchen
c7a8f374339b New theory: type inference for let-free MiniML nipkow parents: diff changeset	5
c7a8f374339b New theory: type inference for let-free MiniML nipkow parents: diff changeset	6	Type inference algorithm W
c7a8f374339b New theory: type inference for let-free MiniML nipkow parents: diff changeset	7	*)
c7a8f374339b New theory: type inference for let-free MiniML nipkow parents: diff changeset	8
c7a8f374339b New theory: type inference for let-free MiniML nipkow parents: diff changeset	9	W = MiniML +
c7a8f374339b New theory: type inference for let-free MiniML nipkow parents: diff changeset	10
c7a8f374339b New theory: type inference for let-free MiniML nipkow parents: diff changeset	11	types
1400 5d909faf0e04 Introduced Monad syntax Pat := Val; Cont nipkow parents: 1376 diff changeset	12	result_W = "(subst * typ * nat)maybe"
1300 c7a8f374339b New theory: type inference for let-free MiniML nipkow parents: diff changeset	13
c7a8f374339b New theory: type inference for let-free MiniML nipkow parents: diff changeset	14	(* type inference algorithm W *)
c7a8f374339b New theory: type inference for let-free MiniML nipkow parents: diff changeset	15	consts
1476 608483c2122a expanded tabs; incorporated Konrad's changes clasohm parents: 1402 diff changeset	16	W :: [expr, typ list, nat] => result_W
1300 c7a8f374339b New theory: type inference for let-free MiniML nipkow parents: diff changeset	17
c7a8f374339b New theory: type inference for let-free MiniML nipkow parents: diff changeset	18	primrec W expr
1476 608483c2122a expanded tabs; incorporated Konrad's changes clasohm parents: 1402 diff changeset	19	W_Var "W (Var i) a n = (if i < length a then Ok(id_subst, nth i a, n)
608483c2122a expanded tabs; incorporated Konrad's changes clasohm parents: 1402 diff changeset	20	else Fail)"
608483c2122a expanded tabs; incorporated Konrad's changes clasohm parents: 1402 diff changeset	21	W_Abs "W (Abs e) a n = ( (s,t,m) := W e ((TVar n)#a) (Suc n);
608483c2122a expanded tabs; incorporated Konrad's changes clasohm parents: 1402 diff changeset	22	Ok(s, (s n) -> t, m) )"
608483c2122a expanded tabs; incorporated Konrad's changes clasohm parents: 1402 diff changeset	23	W_App "W (App e1 e2) a n =
608483c2122a expanded tabs; incorporated Konrad's changes clasohm parents: 1402 diff changeset	24	( (s1,t1,m1) := W e1 a n;
608483c2122a expanded tabs; incorporated Konrad's changes clasohm parents: 1402 diff changeset	25	(s2,t2,m2) := W e2 ($s1 a) m1;
608483c2122a expanded tabs; incorporated Konrad's changes clasohm parents: 1402 diff changeset	26	u := mgu ($s2 t1) (t2 -> (TVar m2));
608483c2122a expanded tabs; incorporated Konrad's changes clasohm parents: 1402 diff changeset	27	Ok( $u o $s2 o s1, $u (TVar m2), Suc m2) )"
1300 c7a8f374339b New theory: type inference for let-free MiniML nipkow parents: diff changeset	28	end

author	paulson
	Fri, 10 May 1996 17:03:17 +0200
changeset 1743	f7feaacd33d3
parent 1476	608483c2122a
child 1900	c7a869229091
permissions	-rw-r--r--