Nice/src/mlsub/typing NullnessKind.java,1.8,1.9 Monotype.java,1.12,1.13

Update of /cvsroot/nice/Nice/src/mlsub/typing
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv29740/src/mlsub/typing

Modified Files:
	NullnessKind.java Monotype.java 
Log Message:
'?' is not a subtype of Object, only of ?Object.


Index: NullnessKind.java
===================================================================
RCS file: /cvsroot/nice/Nice/src/mlsub/typing/NullnessKind.java,v
retrieving revision 1.8
retrieving revision 1.9
diff -C2 -d -r1.8 -r1.9
*** NullnessKind.java	9 Jun 2005 11:57:00 -0000	1.8
--- NullnessKind.java	18 Jun 2005 09:58:39 -0000	1.9
***************
*** 38,42 ****
    public int arity() { return 1; }
  
!   private static TypeConstructor maybe, sure;
  
    public Monotype freshMonotype(boolean existential)
--- 38,42 ----
    public int arity() { return 1; }
  
!   static TypeConstructor maybe, sure;
  
    public Monotype freshMonotype(boolean existential)

Index: Monotype.java
===================================================================
RCS file: /cvsroot/nice/Nice/src/mlsub/typing/Monotype.java,v
retrieving revision 1.12
retrieving revision 1.13
diff -C2 -d -r1.12 -r1.13
*** Monotype.java	9 Jun 2005 11:57:00 -0000	1.12
--- Monotype.java	18 Jun 2005 09:58:39 -0000	1.13
***************
*** 131,134 ****
--- 131,141 ----
      if (geq)
        {
+         // We must check that this monotype is not non-null
+         TypeConstructor head = head();
+         if (head == null)
+           throw mlsub.typing.lowlevel.LowlevelUnsatisfiable.instance;
+         else
+           mlsub.typing.lowlevel.Engine.leq(NullnessKind.maybe, head);
+ 
          Monotype raw = nice.tools.typing.Types.rawType(this);
          mlsub.typing.lowlevel.Engine.leq(TopMonotype.instance, raw);



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