for review: inst_is_free(free(Type), _)

[Fergus Henderson]

compiler/mode_util.m:
	Change `inst_is_free' so that it succeeds for free/1 insts
	as well as free/0 insts.  (Currently we're not creating any
	free/1 insts, so this bug has gone unnoticed.)

Index: mode_util.m
===================================================================
RCS file: /home/staff/zs/imp/mercury/compiler/mode_util.m,v
retrieving revision 1.83
diff -u -r1.83 mode_util.m
--- mode_util.m	1997/02/28 05:30:31	1.83
+++ mode_util.m	1997/04/06 08:32:00
@@ -420,7 +420,7 @@
 		ArgInst = not_reached
 	).
 get_single_arg_inst(free, _, _, free).
-get_single_arg_inst(free(_Type), _, _, free).
+get_single_arg_inst(free(_Type), _, _, free).	% XXX loses type info
 get_single_arg_inst(any(Uniq), _, _, any(Uniq)).
 get_single_arg_inst(abstract_inst(_, _), _, _, _) :-
 	error("get_single_arg_inst: abstract insts not supported").
@@ -483,6 +483,7 @@
 :- inst_is_free(_, X) when X.		% NU-Prolog indexing.
 
 inst_is_free(_, free).
+inst_is_free(_, free(_Type)).
 inst_is_free(_, inst_var(_)) :-
 	error("internal error: uninstantiated inst parameter").
 inst_is_free(ModuleInfo, defined_inst(InstName)) :-

-- 
Fergus Henderson <fjh at cs.mu.oz.au>   |  "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh>   |  of excellence is a lethal habit"
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