[m-dev.] trivial diff: fix inverted test in MR_DETISM_CAN_FAIL

[Simon Taylor]

Estimated hours taken: 0.25

runtime/mercury_stack_layout.h:
	The test in the macro MR_DETISM_CAN_FAIL was inverted.
	MR_DETISM_CAN_FAIL isn't used anywhere yet.


Index: mercury_stack_layout.h
===================================================================
RCS file: /home/mercury1/repository/mercury/runtime/mercury_stack_layout.h,v
retrieving revision 1.47
retrieving revision 1.48
diff -u -u -r1.47 -r1.48
--- mercury_stack_layout.h	2001/01/18 03:01:44	1.47
+++ mercury_stack_layout.h	2001/01/21 03:24:54	1.48
@@ -76,7 +76,7 @@
 #define MR_DETISM_AT_MOST_ONE(d)	(((d) & 3) == 2)
 #define MR_DETISM_AT_MOST_MANY(d)	(((d) & 1) != 0)
 
-#define MR_DETISM_CAN_FAIL(d)		(((d) & 4) != 0)
+#define MR_DETISM_CAN_FAIL(d)		(((d) & 4) == 0)
 
 #define MR_DETISM_FIRST_SOLN(d)		(((d) & 8) != 0)
 
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