diff --git a/C/absmi.c b/C/absmi.c
index aa9448861..8c304b920 100644
--- a/C/absmi.c
+++ b/C/absmi.c
@@ -10,8 +10,11 @@
 *									 *
 * File:		absmi.c							 *
 * comments:	Portable abstract machine interpreter                    *
-* Last rev:     $Date: 2004-08-16 21:02:04 $,$Author: vsc $						 *
+* Last rev:     $Date: 2004-09-17 19:34:49 $,$Author: vsc $						 *
 * $Log: not supported by cvs2svn $
+* Revision 1.143  2004/08/16 21:02:04  vsc
+* more fixes for !
+*
 * Revision 1.142  2004/08/11 16:14:51  vsc
 * whole lot of fixes:
 *   - memory leak in indexing
@@ -1389,9 +1392,18 @@ Yap_absmi(int inp)
 	ASP = YREG;
 	saveregs();
 	while ((t = Yap_FetchTermFromDB(cl->ClSource)) == 0L) {
-	  if (!Yap_gc(3, ENV, CP)) {
-	    Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
-	    FAIL();
+	  if (Yap_Error_TYPE == OUT_OF_ATTVARS_ERROR) {
+	    Yap_Error_TYPE = YAP_NO_ERROR;
+	    if (!Yap_growglobal(NULL)) {
+	      Yap_Error(OUT_OF_ATTVARS_ERROR, TermNil, Yap_ErrorMessage);
+	      FAIL();
+	    }
+	  } else {
+	    Yap_Error_TYPE = YAP_NO_ERROR;
+	    if (!Yap_gc(3, ENV, CP)) {
+	      Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
+	      FAIL();
+	    }
 	  }
 	}
 	if (!Yap_IUnify(ARG2, t)) {
diff --git a/C/arrays.c b/C/arrays.c
index c005d47fc..010752cde 100644
--- a/C/arrays.c
+++ b/C/arrays.c
@@ -267,9 +267,18 @@ AccessNamedArray(Atom a, Int indx)
 	  READ_UNLOCK(ptr->ArRWLock);
 	  if (ref != NULL) {
 	    while ((TRef = Yap_FetchTermFromDB(ref)) == 0L) {
-	      if (!Yap_gc(3, ENV, CP)) {
-		Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
-		return(TermNil);
+	      if (Yap_Error_TYPE == OUT_OF_ATTVARS_ERROR) {
+		Yap_Error_TYPE = YAP_NO_ERROR;
+		if (!Yap_growglobal(NULL)) {
+		  Yap_Error(OUT_OF_ATTVARS_ERROR, TermNil, Yap_ErrorMessage);
+		  return TermNil;
+		}
+	      } else {
+		Yap_Error_TYPE = YAP_NO_ERROR;
+		if (!Yap_gc(3, ENV, CP)) {
+		  Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
+		  return(TermNil);
+		}
 	      }
 	    }
 	  } else {
@@ -1961,9 +1970,18 @@ p_static_array_to_term(void)
 
 	    if (ref != NULL) {
 	      while ((TRef = Yap_FetchTermFromDB(ref)) == 0L) {
-		if (!Yap_gc(3, YENV, P)) {
-		  Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
-		  return(TermNil);
+		if (Yap_Error_TYPE == OUT_OF_ATTVARS_ERROR) {
+		  Yap_Error_TYPE = YAP_NO_ERROR;
+		  if (!Yap_growglobal(NULL)) {
+		    Yap_Error(OUT_OF_ATTVARS_ERROR, TermNil, Yap_ErrorMessage);
+		    return TermNil;
+		  }
+		} else {
+		  Yap_Error_TYPE = YAP_NO_ERROR;
+		  if (!Yap_gc(3, YENV, P)) {
+		    Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
+		    return TermNil;
+		  }
 		}
 	      }
 	    } else {
diff --git a/C/bb.c b/C/bb.c
index 49469d818..f6c180e22 100644
--- a/C/bb.c
+++ b/C/bb.c
@@ -272,9 +272,18 @@ p_bb_get(void)
     return(FALSE);
   READ_LOCK(p->BBRWLock);  
   while ((out = Yap_FetchTermFromDB(p->Element)) == 0L) {
-    if (!Yap_gc(2, ENV, P)) {
-      Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
-      return(TermNil);
+    if (Yap_Error_TYPE == OUT_OF_ATTVARS_ERROR) {
+      Yap_Error_TYPE = YAP_NO_ERROR;
+      if (!Yap_growglobal(NULL)) {
+	Yap_Error(OUT_OF_ATTVARS_ERROR, TermNil, Yap_ErrorMessage);
+	return TermNil;
+      }
+    } else {
+      Yap_Error_TYPE = YAP_NO_ERROR;
+      if (!Yap_gc(2, ENV, P)) {
+	Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
+	return TermNil;
+      }
     }
   }
   READ_UNLOCK(p->BBRWLock);
@@ -292,9 +301,18 @@ p_bb_delete(void)
   if (p == NULL || p->Element == NULL)
     return(FALSE);
   while ((out = Yap_FetchTermFromDB(p->Element)) == 0L) {
-    if (!Yap_gc(2, ENV, P)) {
-      Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
-      return(TermNil);
+    if (Yap_Error_TYPE == OUT_OF_ATTVARS_ERROR) {
+      Yap_Error_TYPE = YAP_NO_ERROR;
+      if (!Yap_growglobal(NULL)) {
+	Yap_Error(OUT_OF_ATTVARS_ERROR, TermNil, Yap_ErrorMessage);
+	return TermNil;
+      }
+    } else {
+      Yap_Error_TYPE = YAP_NO_ERROR;
+      if (!Yap_gc(2, ENV, P)) {
+	Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
+	return TermNil;
+      }
     }
   }
   WRITE_LOCK(p->BBRWLock);  
@@ -316,9 +334,18 @@ p_bb_update(void)
     return(FALSE);
   WRITE_LOCK(p->BBRWLock);  
   while ((out = Yap_FetchTermFromDB(p->Element)) == 0L) {
-    if (!Yap_gc(3, ENV, P)) {
-      Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
-      return(TermNil);
+    if (Yap_Error_TYPE == OUT_OF_ATTVARS_ERROR) {
+      Yap_Error_TYPE = YAP_NO_ERROR;
+      if (!Yap_growglobal(NULL)) {
+	Yap_Error(OUT_OF_ATTVARS_ERROR, TermNil, Yap_ErrorMessage);
+	return TermNil;
+      }
+    } else {
+      Yap_Error_TYPE = YAP_NO_ERROR;
+      if (!Yap_gc(3, ENV, P)) {
+	Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
+	return TermNil;
+      }
     }
   }
   if (!Yap_unify(ARG2,out)) {
diff --git a/C/cdmgr.c b/C/cdmgr.c
index cb5103a1f..b4f485de0 100644
--- a/C/cdmgr.c
+++ b/C/cdmgr.c
@@ -11,8 +11,12 @@
 * File:		cdmgr.c							 *
 * comments:	Code manager						 *
 *									 *
-* Last rev:     $Date: 2004-09-08 17:56:45 $,$Author: vsc $						 *
+* Last rev:     $Date: 2004-09-17 19:34:51 $,$Author: vsc $						 *
 * $Log: not supported by cvs2svn $
+* Revision 1.131  2004/09/08 17:56:45  vsc
+* source: a(X) :- true is a fact!
+* fix use of value after possible overflow in IPred
+*
 * Revision 1.130  2004/09/07 16:48:04  vsc
 * fix bug in unwinding trail at amiops.h
 *
@@ -3316,9 +3320,18 @@ fetch_next_lu_clause(PredEntry *pe, yamop *i_code, Term th, Term tb, Term tr, ya
 	ARG5 = th;
 	ARG6 = tb;
 	ARG7 = tr;
-	if (!Yap_gc(7, YENV, P)) {
-	  Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
-	  return FALSE;
+	if (Yap_Error_TYPE == OUT_OF_ATTVARS_ERROR) {
+	  Yap_Error_TYPE = YAP_NO_ERROR;
+	  if (!Yap_growglobal(NULL)) {
+	    Yap_Error(OUT_OF_ATTVARS_ERROR, TermNil, Yap_ErrorMessage);
+	    return FALSE;
+	  }
+	} else {
+	  Yap_Error_TYPE = YAP_NO_ERROR;
+	  if (!Yap_gc(7, YENV, P)) {
+	    Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
+	    return FALSE;
+	  }
 	}
 	th = ARG5;
 	tb = ARG6;
@@ -3427,9 +3440,18 @@ fetch_next_lu_clause0(PredEntry *pe, yamop *i_code, Term th, Term tb, yamop *cp_
 
     while ((t = Yap_FetchTermFromDB(cl->ClSource)) == 0L) {
       if (first_time) {
-	if (!Yap_gc(4, YENV, P)) {
-	  Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
-	  return FALSE;
+	if (Yap_Error_TYPE == OUT_OF_ATTVARS_ERROR) {
+	  Yap_Error_TYPE = YAP_NO_ERROR;
+	  if (!Yap_growglobal(NULL)) {
+	    Yap_Error(OUT_OF_ATTVARS_ERROR, TermNil, Yap_ErrorMessage);
+	    return FALSE;
+	  }
+	} else {
+	  Yap_Error_TYPE = YAP_NO_ERROR;
+	  if (!Yap_gc(4, YENV, P)) {
+	    Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
+	    return FALSE;
+	  }
 	}
       } else {
 	if (!Yap_gc(5, ENV, CP)) {
@@ -3527,9 +3549,18 @@ fetch_next_static_clause(PredEntry *pe, yamop *i_code, Term th, Term tb, Term tr
 
     while ((t = Yap_FetchTermFromDB(cl->usc.ClSource)) == 0L) {
       if (first_time) {
-	if (!Yap_gc(4, YENV, P)) {
-	  Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
-	  return FALSE;
+	if (Yap_Error_TYPE == OUT_OF_ATTVARS_ERROR) {
+	  Yap_Error_TYPE = YAP_NO_ERROR;
+	  if (!Yap_growglobal(NULL)) {
+	    Yap_Error(OUT_OF_ATTVARS_ERROR, TermNil, Yap_ErrorMessage);
+	    return FALSE;
+	  }
+	} else {
+	  Yap_Error_TYPE = YAP_NO_ERROR;
+	  if (!Yap_gc(4, YENV, P)) {
+	    Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
+	    return FALSE;
+	  }
 	}
       } else {
 	if (!Yap_gc(5, ENV, CP)) {
diff --git a/C/dbase.c b/C/dbase.c
index c09be40db..0dd6e1dc6 100644
--- a/C/dbase.c
+++ b/C/dbase.c
@@ -21,6 +21,7 @@ static char     SccsId[] = "%W% %G%";
 #include "Yap.h"
 #include "clause.h"
 #include "yapio.h"
+#include "attvar.h"
 #include "heapgc.h"
 #if HAVE_STRING_H
 #include <string.h>
@@ -2389,18 +2390,21 @@ p_still_variant(void)
 
 
 #ifdef COROUTINING
-static void
+static int
 copy_attachments(CELL *ts)
 {
   while (TRUE) {
-    Term t;
+
+    attvar_record *orig = (attvar_record *)Yap_ReadTimedVar(DelayedVars);
     /* store away in case there is an overflow */
-    *--ASP = ts[3];
-    attas[IntegerOfTerm(ts[2])].term_to_op(ts[1], ts[0]);
-    t = *ASP;
-    ASP++;
-    if (t == TermNil) return;
-    ts = RepAppl(t)+1;
+    if (attas[IntegerOfTerm(ts[2])].term_to_op(ts[1], ts[0])  == FALSE) {
+      /* oops, we did not have enough space to copy the elements */
+      /* reset queue of woken up goals */
+      Yap_UpdateTimedVar(DelayedVars, (CELL)orig);      
+      return FALSE;
+    }
+    if (ts[3] == TermNil) return TRUE;
+    ts = RepAppl(ts[3])+1;
   }
 }
 #endif
@@ -2505,6 +2509,7 @@ GetDBTerm(DBTerm *DBSP)
 	  fprintf(Yap_stderr, "\n\n [ FATAL ERROR: No Stack for Error Handling ]\n");
 	  Yap_exit( 1);
       } else {
+	Yap_Error_TYPE = OUT_OF_STACK_ERROR;
 	Yap_Error_Size = NOf*sizeof(CELL);
 	return (Term)0;
       }
@@ -2520,9 +2525,11 @@ GetDBTerm(DBTerm *DBSP)
 #endif
 #ifdef COROUTINING
     if (DBSP->attachments != 0L)  {
-      *--ASP = (CELL)HOld;
-      copy_attachments((CELL *)AdjustIDBPtr(DBSP->attachments,(CELL)HOld-(CELL)(DBSP->Contents)));
-      HOld = CellPtr(*ASP++);
+      if (!copy_attachments((CELL *)AdjustIDBPtr(DBSP->attachments,(CELL)HOld-(CELL)(DBSP->Contents)))) {
+	  Yap_Error_TYPE = OUT_OF_ATTVARS_ERROR;
+	  Yap_Error_Size = 0;
+	  return (Term)0;
+      }
     }
 #endif
     return AdjustIDBPtr(t,Unsigned(HOld)-(CELL)(DBSP->Contents));
@@ -3113,10 +3120,20 @@ i_recorded(DBProp AtProp, Term t3)
       /* make sure the garbage collector sees what we want it to see! */
       EXTRA_CBACK_ARG(3,1) = (CELL)ref;
       /* oops, we are in trouble, not enough stack space */
-      if (!Yap_gcl(Yap_Error_Size, 3, ENV, CP)) {
-	Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
-	return(FALSE);
+      if (Yap_Error_TYPE == OUT_OF_ATTVARS_ERROR) {
+	Yap_Error_TYPE = YAP_NO_ERROR;
+	if (!Yap_growglobal(NULL)) {
+	  Yap_Error(OUT_OF_ATTVARS_ERROR, TermNil, Yap_ErrorMessage);
+	  return FALSE;
+	}
+      } else {
+	Yap_Error_TYPE = YAP_NO_ERROR;
+	if (!Yap_gcl(Yap_Error_Size, 3, ENV, CP)) {
+	  Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
+	  return FALSE;
+	}
       }
+      Yap_Error_Size = 0;
       twork = Deref(ARG2);
       t3 = Deref(ARG3);
     }
@@ -3175,9 +3192,18 @@ i_recorded(DBProp AtProp, Term t3)
 	EXTRA_CBACK_ARG(3,2) = MkIntegerTerm(((Int)mask));
 	EXTRA_CBACK_ARG(3,3) = MkIntegerTerm(((Int)key));
 	/* oops, we are in trouble, not enough stack space */
-	if (!Yap_gcl(Yap_Error_Size, 3, ENV, CP)) {
-	  Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
-	  return(FALSE);
+	if (Yap_Error_TYPE == OUT_OF_ATTVARS_ERROR) {
+	  Yap_Error_TYPE = YAP_NO_ERROR;
+	  if (!Yap_growglobal(NULL)) {
+	    Yap_Error(OUT_OF_ATTVARS_ERROR, TermNil, Yap_ErrorMessage);
+	    return FALSE;
+	  }
+	} else {
+	  Yap_Error_TYPE = YAP_NO_ERROR;
+	  if (!Yap_gcl(Yap_Error_Size, 3, ENV, CP)) {
+	    Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
+	    return(FALSE);
+	  }
 	}
 	READ_LOCK(AtProp->DBRWLock);
       }
@@ -3262,10 +3288,20 @@ c_recorded(int flags)
       /* make sure the garbage collector sees what we want it to see! */
       EXTRA_CBACK_ARG(3,1) = (CELL)ref;
       /* oops, we are in trouble, not enough stack space */
-      if (!Yap_gcl(Yap_Error_Size, 3, ENV, CP)) {
-	Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
-	return(FALSE);
+      if (Yap_Error_TYPE == OUT_OF_ATTVARS_ERROR) {
+	Yap_Error_TYPE = YAP_NO_ERROR;
+	if (!Yap_growglobal(NULL)) {
+	  Yap_Error(OUT_OF_ATTVARS_ERROR, TermNil, Yap_ErrorMessage);
+	  return FALSE;
+	}
+      } else {
+	Yap_Error_TYPE = YAP_NO_ERROR;
+	if (!Yap_gcl(Yap_Error_Size, 3, ENV, CP)) {
+	  Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
+	  return(FALSE);
+	}
       }
+      Yap_Error_Size = 0;
       PreviousHeap = H;
     }
     Yap_unify(ARG2, TermDB);
@@ -3295,10 +3331,20 @@ c_recorded(int flags)
 	/* make sure the garbage collector sees what we want it to see! */
 	EXTRA_CBACK_ARG(3,1) = (CELL)ref;
 	/* oops, we are in trouble, not enough stack space */
-	if (!Yap_gcl(Yap_Error_Size, 3, ENV, CP)) {
-	  Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
-	  return(FALSE);
+	if (Yap_Error_TYPE == OUT_OF_ATTVARS_ERROR) {
+	  Yap_Error_TYPE = YAP_NO_ERROR;
+	  if (!Yap_growglobal(NULL)) {
+	    Yap_Error(OUT_OF_ATTVARS_ERROR, TermNil, Yap_ErrorMessage);
+	    return FALSE;
+	  }
+	} else {
+	  Yap_Error_TYPE = YAP_NO_ERROR;
+	  if (!Yap_gcl(Yap_Error_Size, 3, ENV, CP)) {
+	    Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
+	    return(FALSE);
+	  }
 	}
+	Yap_Error_Size = 0;
 	PreviousHeap = H;
       }
       if (Yap_unify(ARG2, TermDB))
@@ -3528,9 +3574,18 @@ p_first_instance(void)
 #endif
   while ((TermDB = GetDBTermFromDBEntry(ref)) == (CELL)0) {
     /* oops, we are in trouble, not enough stack space */
-    if (!Yap_gcl(Yap_Error_Size, 3, ENV, P)) {
-      Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
-      return(FALSE);
+    if (Yap_Error_TYPE == OUT_OF_ATTVARS_ERROR) {
+      Yap_Error_TYPE = YAP_NO_ERROR;
+      if (!Yap_growglobal(NULL)) {
+	Yap_Error(OUT_OF_ATTVARS_ERROR, TermNil, Yap_ErrorMessage);
+	return FALSE;
+      }
+    } else {
+      Yap_Error_TYPE = YAP_NO_ERROR;
+      if (!Yap_gcl(Yap_Error_Size, 3, ENV, P)) {
+	Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
+	return(FALSE);
+      }
     }
   }
   if (IsVarTerm(TermDB)) {
@@ -4428,9 +4483,18 @@ static_instance(StaticClause *cl)
 
     while ((TermDB = GetDBTerm(cl->usc.ClSource)) == 0L) {
       /* oops, we are in trouble, not enough stack space */
-      if (!Yap_gcl(Yap_Error_Size, 2, ENV, P)) {
-	Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
-	return(FALSE);
+      if (Yap_Error_TYPE == OUT_OF_ATTVARS_ERROR) {
+	Yap_Error_TYPE = YAP_NO_ERROR;
+	if (!Yap_growglobal(NULL)) {
+	  Yap_Error(OUT_OF_ATTVARS_ERROR, TermNil, Yap_ErrorMessage);
+	  return FALSE;
+	}
+      } else {
+	Yap_Error_TYPE = YAP_NO_ERROR;
+	if (!Yap_gcl(Yap_Error_Size, 2, ENV, P)) {
+	  Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
+	  return(FALSE);
+	}
       }
     }
     return Yap_unify(ARG2, TermDB);
@@ -4491,9 +4555,18 @@ p_instance(void)
       Term            TermDB;
       while ((TermDB = GetDBTerm(cl->ClSource)) == 0L) {
 	/* oops, we are in trouble, not enough stack space */
-	if (!Yap_gcl(Yap_Error_Size, 2, ENV, P)) {
-	  Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
-	  return(FALSE);
+	if (Yap_Error_TYPE == OUT_OF_ATTVARS_ERROR) {
+	  Yap_Error_TYPE = YAP_NO_ERROR;
+	  if (!Yap_growglobal(NULL)) {
+	    Yap_Error(OUT_OF_ATTVARS_ERROR, TermNil, Yap_ErrorMessage);
+	    return FALSE;
+	  }
+	} else {
+	  Yap_Error_TYPE = YAP_NO_ERROR;
+	  if (!Yap_gcl(Yap_Error_Size, 2, ENV, P)) {
+	    Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
+	    return(FALSE);
+	  }
 	}
       }
       return Yap_unify(ARG2, TermDB);
@@ -4502,9 +4575,18 @@ p_instance(void)
     Term            TermDB;
     while ((TermDB = GetDBTermFromDBEntry(dbr)) == 0L) {
       /* oops, we are in trouble, not enough stack space */
-      if (!Yap_gcl(Yap_Error_Size, 2, ENV, P)) {
-	Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
-	return(FALSE);
+      if (Yap_Error_TYPE == OUT_OF_ATTVARS_ERROR) {
+	Yap_Error_TYPE = YAP_NO_ERROR;
+	if (!Yap_growglobal(NULL)) {
+	  Yap_Error(OUT_OF_ATTVARS_ERROR, TermNil, Yap_ErrorMessage);
+	  return FALSE;
+	}
+      } else {
+	Yap_Error_TYPE = YAP_NO_ERROR;
+	if (!Yap_gcl(Yap_Error_Size, 2, ENV, P)) {
+	  Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
+	  return(FALSE);
+	}
       }
       t1 = Deref(ARG1);
     }
@@ -4908,9 +4990,18 @@ p_dequeue(void)
       father_key->FirstInQueue = cur_instance->next;
     WRITE_UNLOCK(father_key->QRWLock);
     while ((TDB = GetDBTerm(cur_instance->DBT)) == 0L) {
-      if (!Yap_gcl(Yap_Error_Size, 2, YENV, P)) {
-	Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
-	return FALSE;
+      if (Yap_Error_TYPE == OUT_OF_ATTVARS_ERROR) {
+	Yap_Error_TYPE = YAP_NO_ERROR;
+	if (!Yap_growglobal(NULL)) {
+	  Yap_Error(OUT_OF_ATTVARS_ERROR, TermNil, Yap_ErrorMessage);
+	  return FALSE;
+	}
+      } else {
+	Yap_Error_TYPE = YAP_NO_ERROR;
+	if (!Yap_gcl(Yap_Error_Size, 2, YENV, P)) {
+	  Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
+	  return FALSE;
+	}
       }
     }
     /* release space for cur_instance */
@@ -5095,6 +5186,7 @@ Yap_InitDBPreds(void)
 #ifdef DEBUG
   Yap_InitCPred("total_erased", 4, p_total_erased, SyncPredFlag);
   Yap_InitCPred("key_erased_statistics", 5, p_key_erased_statistics, SyncPredFlag);
+  Yap_InitCPred("predicate_erased_statistics", 5, p_predicate_erased_statistics, SyncPredFlag);
   Yap_InitCPred("heap_space_info", 3, p_heap_space_info, SyncPredFlag);
 #endif
   Yap_InitCPred("nth_instance", 3, p_nth_instance, SyncPredFlag);
diff --git a/C/errors.c b/C/errors.c
index 39b4d6e50..46b378dfc 100644
--- a/C/errors.c
+++ b/C/errors.c
@@ -950,6 +950,19 @@ Yap_Error(yap_error_number type, Term where, char *format,...)
       serious = TRUE;
     }
     break;
+  case OUT_OF_ATTVARS_ERROR:
+    {
+      int i;
+
+      dump_stack();
+      i = strlen(tmpbuf);
+      nt[0] = MkAtomTerm(Yap_LookupAtom("out_of_attvars_error"));
+      tp = tmpbuf+i;
+      psize -= i;
+      fun = Yap_MkFunctor(Yap_LookupAtom("error"),2);
+      serious = TRUE;
+    }
+    break;
   case OUT_OF_TRAIL_ERROR:
     {
       int i;
diff --git a/C/heapgc.c b/C/heapgc.c
index 810dbe44f..4747c377f 100644
--- a/C/heapgc.c
+++ b/C/heapgc.c
@@ -2806,7 +2806,6 @@ compact_heap(void)
 	/* oops, we found a blob */
 	int nofcells = (UNMARK_CELL(*current)-EndSpecials) / sizeof(CELL);
 	CELL *ptr = current - nofcells ;
-	CELL func = ptr[0];
 
 	if (MARKED_PTR(ptr)) {
 #ifdef DEBUG
diff --git a/m4/Yap.h.m4 b/m4/Yap.h.m4
index 9dddb847f..98136b365 100644
--- a/m4/Yap.h.m4
+++ b/m4/Yap.h.m4
@@ -10,7 +10,7 @@
 * File:		Yap.h.m4						 *
 * mods:									 *
 * comments:	main header file for YAP				 *
-* version:      $Id: Yap.h.m4,v 1.64 2004-09-16 17:29:08 vsc Exp $	 *
+* version:      $Id: Yap.h.m4,v 1.65 2004-09-17 19:34:52 vsc Exp $	 *
 *************************************************************************/
 
 #include "config.h"
@@ -466,6 +466,7 @@ typedef enum {
   OUT_OF_HEAP_ERROR,
   OUT_OF_STACK_ERROR,
   OUT_OF_TRAIL_ERROR,
+  OUT_OF_ATTVARS_ERROR,
   PERMISSION_ERROR_ACCESS_PRIVATE_PROCEDURE,
   PERMISSION_ERROR_NEW_ALIAS_FOR_STREAM,
   PERMISSION_ERROR_CREATE_ARRAY,
diff --git a/pl/corout.yap b/pl/corout.yap
index abbac848d..a99f93539 100644
--- a/pl/corout.yap
+++ b/pl/corout.yap
@@ -490,15 +490,11 @@ when(_,Goal) :-
 	'$$compile'((S :- var(A), !, freeze(A, S)), (S :- var(A), !, freeze(A, S)), 5, M), fail.
 '$wait'(_).
 
-frozen(V, G) :- nonvar(V), !, G = true.
+frozen(V, G) :- nonvar(V), !,
+	'$do_error'(type_error(variable,V),frozen(V,G)).
 frozen(V, LG) :-
-	'$project'([V],[V],G),
-	'$simplify_list_of_frozen_goals'(G,LG).
-%write(vsc:G0), nl,
-%	'$purge_done_goals'(G0, GI),
-%	'$sort'(GI, GII),
-%write(vsc:GII), nl,
-%	'$convert_list_of_frozen_goals'(GII, G).
+	'$project'([V],[V],Gs),
+	'$simplify_list_of_frozen_goals'(Gs,LG).
 
 '$simplify_list_of_frozen_goals'([],[]).
 '$simplify_list_of_frozen_goals'([(_-G)|Gs],[G|NGs]) :-
@@ -600,11 +596,10 @@ call_residue(Goal,Residue) :-
 
 
 '$project'([],_,[]).
-'$project'([V|LAV],_,LGs) :-
+'$project'(Vs,_,LGs) :-
 	% we don't have constraints yet, so we must be talking about delays.
 	'$undefined'(modules_with_attributes(LAV),attributes), !,
-	attributes:all_attvars(NLAV),
-	'$fetch_delays'(NLAV,LGs, []).
+	'$fetch_delays'(Vs, LGs, []).
 '$project'([V|LAV],LIV,LDs) :-
 	attributes:modules_with_attributes(LMods),
 	'$pick_vars_for_project'(LIV,NLIV),
diff --git a/pl/errors.yap b/pl/errors.yap
index b92e023e2..64e0f1ca1 100644
--- a/pl/errors.yap
+++ b/pl/errors.yap
@@ -11,8 +11,14 @@
 * File:		errors.yap						 *
 * comments:	error messages for YAP					 *
 *									 *
-* Last rev:     $Date: 2004-07-22 21:32:22 $,$Author: vsc $						 *
+* Last rev:     $Date: 2004-09-17 19:34:53 $,$Author: vsc $						 *
 * $Log: not supported by cvs2svn $
+* Revision 1.54  2004/07/22 21:32:22  vsc
+* debugger fixes
+* initial support for JPL
+* bad calls to garbage collector and gc
+* debugger fixes
+*
 * Revision 1.53  2004/06/23 17:24:20  vsc
 * New comment-based message style
 * Fix thread support (at least don't deadlock with oneself)
@@ -472,6 +478,9 @@ print_message(Level, Mss) :-
 '$output_error_message'(out_of_trail_error, Where) :-
 	format(user_error,'% OUT OF TRAIL SPACE ERROR- ~w~n',
 	[Where]).
+'$output_error_message'(out_of_attvars_error, Where) :-
+	format(user_error,'% OUT OF STACK SPACE ERROR- ~w~n',
+	[Where]).
 '$output_error_message'(permission_error(access,private_procedure,P), Where) :-
 	format(user_error,'% PERMISSION ERROR- ~w: cannot see clauses for ~w~n',
 	[Where,P]).