Eliminate use of Nullop in the core code. Dual life uses remain.

p4raw-id: //depot/perl@33269

4 files changed, 69 insertions, 67 deletions

diff --git a/op.h b/op.h
index fd0ec3432b..5c189008b8 100644
--- a/op.h
+++ b/op.h
@@ -517,7 +517,9 @@ struct loop {
 #define cSVOPo_sv		cSVOPx_sv(o)
 #define kSVOP_sv		cSVOPx_sv(kid)
 
-#define Nullop ((OP*)NULL)
+#ifndef PERL_CORE
+#  define Nullop ((OP*)NULL)
+#endif
 
 /* Lowest byte-and-a-bit of PL_opargs */
 #define OA_MARK 1
diff --git a/perly.act b/perly.act
index 61c8f5b44a..4ff627cc05 100644
--- a/perly.act
+++ b/perly.act
@@ -47,7 +47,7 @@ case 2:
 
   case 9:
 #line 180 "perly.y"
-    { (yyval.opval) = Nullop; ;}
+    { (yyval.opval) = (OP*)NULL; ;}
     break;
 
   case 10:
@@ -97,7 +97,7 @@ case 2:
 			  else {
 			      (yyval.opval) = IF_MAD(
 					newOP(OP_NULL, 0),
-					Nullop);
+					(OP*)NULL);
                               PL_parser->copline = NOLINE;
 			      TOKEN_FREE((ps[(1) - (2)].val.p_tkval));
 			      TOKEN_GETMAD((ps[(2) - (2)].val.i_tkval),(yyval.opval),';');
@@ -127,7 +127,7 @@ case 2:
 
   case 18:
 #line 243 "perly.y"
-    { (yyval.opval) = Nullop; ;}
+    { (yyval.opval) = (OP*)NULL; ;}
     break;
 
   case 19:
@@ -166,14 +166,14 @@ case 2:
   case 24:
 #line 263 "perly.y"
     { (yyval.opval) = newFOROP(0, NULL, (line_t)IVAL((ps[(2) - (3)].val.i_tkval)),
-					Nullop, (ps[(3) - (3)].val.opval), (ps[(1) - (3)].val.opval), Nullop);
+					(OP*)NULL, (ps[(3) - (3)].val.opval), (ps[(1) - (3)].val.opval), (OP*)NULL);
 			  TOKEN_GETMAD((ps[(2) - (3)].val.i_tkval),((LISTOP*)(yyval.opval))->op_first->op_sibling,'w');
 			;}
     break;
 
   case 25:
 #line 271 "perly.y"
-    { (yyval.opval) = Nullop; ;}
+    { (yyval.opval) = (OP*)NULL; ;}
     break;
 
   case 26:
@@ -229,7 +229,7 @@ case 2:
 
   case 32:
 #line 315 "perly.y"
-    { (yyval.opval) = Nullop; ;}
+    { (yyval.opval) = (OP*)NULL; ;}
     break;
 
   case 33:
@@ -245,7 +245,7 @@ case 2:
 			  PL_parser->copline = (line_t)(ps[(2) - (9)].val.i_tkval);
 			    (yyval.opval) = block_end((ps[(4) - (9)].val.ival),
 				   newSTATEOP(0, PVAL((ps[(1) - (9)].val.p_tkval)),
-				     innerop = newWHILEOP(0, 1, (LOOP*)Nullop,
+				     innerop = newWHILEOP(0, 1, (LOOP*)(OP*)NULL,
 						IVAL((ps[(2) - (9)].val.i_tkval)), (ps[(5) - (9)].val.opval), (ps[(8) - (9)].val.opval), (ps[(9) - (9)].val.opval), (ps[(7) - (9)].val.ival))));
 			  TOKEN_GETMAD((ps[(1) - (9)].val.p_tkval),innerop,'L');
 			  TOKEN_GETMAD((ps[(2) - (9)].val.i_tkval),innerop,'W');
@@ -260,7 +260,7 @@ case 2:
 			  PL_parser->copline = (line_t)(ps[(2) - (9)].val.i_tkval);
 			    (yyval.opval) = block_end((ps[(4) - (9)].val.ival),
 				   newSTATEOP(0, PVAL((ps[(1) - (9)].val.p_tkval)),
-				     innerop = newWHILEOP(0, 1, (LOOP*)Nullop,
+				     innerop = newWHILEOP(0, 1, (LOOP*)(OP*)NULL,
 						IVAL((ps[(2) - (9)].val.i_tkval)), (ps[(5) - (9)].val.opval), (ps[(8) - (9)].val.opval), (ps[(9) - (9)].val.opval), (ps[(7) - (9)].val.ival))));
 			  TOKEN_GETMAD((ps[(1) - (9)].val.p_tkval),innerop,'L');
 			  TOKEN_GETMAD((ps[(2) - (9)].val.i_tkval),innerop,'W');
@@ -301,7 +301,7 @@ case 2:
     { OP *innerop;
 			  (yyval.opval) = block_end((ps[(4) - (8)].val.ival),
 			     innerop = newFOROP(0, PVAL((ps[(1) - (8)].val.p_tkval)), (line_t)IVAL((ps[(2) - (8)].val.i_tkval)),
-						    Nullop, (ps[(5) - (8)].val.opval), (ps[(7) - (8)].val.opval), (ps[(8) - (8)].val.opval)));
+						    (OP*)NULL, (ps[(5) - (8)].val.opval), (ps[(7) - (8)].val.opval), (ps[(8) - (8)].val.opval)));
 			  TOKEN_GETMAD((ps[(1) - (8)].val.p_tkval),((LISTOP*)innerop)->op_first,'L');
 			  TOKEN_GETMAD((ps[(2) - (8)].val.i_tkval),((LISTOP*)innerop)->op_first->op_sibling,'W');
 			  TOKEN_GETMAD((ps[(3) - (8)].val.i_tkval),((LISTOP*)innerop)->op_first->op_sibling,'(');
@@ -314,7 +314,7 @@ case 2:
     { OP *forop;
 			  PL_parser->copline = (line_t)IVAL((ps[(2) - (12)].val.i_tkval));
 			  forop = newSTATEOP(0, PVAL((ps[(1) - (12)].val.p_tkval)),
-					    newWHILEOP(0, 1, (LOOP*)Nullop,
+					    newWHILEOP(0, 1, (LOOP*)(OP*)NULL,
 						IVAL((ps[(2) - (12)].val.i_tkval)), scalar((ps[(7) - (12)].val.opval)),
 						(ps[(12) - (12)].val.opval), (ps[(10) - (12)].val.opval), (ps[(9) - (12)].val.ival)));
 #ifdef MAD
@@ -345,8 +345,8 @@ case 2:
   case 40:
 #line 412 "perly.y"
     { (yyval.opval) = newSTATEOP(0, PVAL((ps[(1) - (3)].val.p_tkval)),
-				 newWHILEOP(0, 1, (LOOP*)Nullop,
-					    NOLINE, Nullop, (ps[(2) - (3)].val.opval), (ps[(3) - (3)].val.opval), 0));
+				 newWHILEOP(0, 1, (LOOP*)(OP*)NULL,
+					    NOLINE, (OP*)NULL, (ps[(2) - (3)].val.opval), (ps[(3) - (3)].val.opval), 0));
 			  TOKEN_GETMAD((ps[(1) - (3)].val.p_tkval),((LISTOP*)(yyval.opval))->op_first,'L'); ;}
     break;
 
@@ -368,7 +368,7 @@ case 2:
 
   case 43:
 #line 435 "perly.y"
-    { (yyval.opval) = Nullop; ;}
+    { (yyval.opval) = (OP*)NULL; ;}
     break;
 
   case 45:
@@ -458,7 +458,7 @@ case 2:
 			  token_free((ps[(1) - (4)].val.i_tkval));
 #else
 			  newFORM((ps[(2) - (4)].val.ival), (ps[(3) - (4)].val.opval), (ps[(4) - (4)].val.opval));
-			  (yyval.opval) = Nullop;
+			  (yyval.opval) = (OP*)NULL;
 #endif
 			;}
     break;
@@ -470,7 +470,7 @@ case 2:
 
   case 62:
 #line 518 "perly.y"
-    { (yyval.opval) = Nullop; ;}
+    { (yyval.opval) = (OP*)NULL; ;}
     break;
 
   case 63:
@@ -481,7 +481,7 @@ case 2:
 			  token_getmad((ps[(1) - (6)].val.i_tkval),(yyval.opval),'d');
 #else
 			  newMYSUB((ps[(2) - (6)].val.ival), (ps[(3) - (6)].val.opval), (ps[(4) - (6)].val.opval), (ps[(5) - (6)].val.opval), (ps[(6) - (6)].val.opval));
-			  (yyval.opval) = Nullop;
+			  (yyval.opval) = (OP*)NULL;
 #endif
 			;}
     break;
@@ -504,7 +504,7 @@ case 2:
 			    }
 #else
 			  newATTRSUB((ps[(2) - (6)].val.ival), (ps[(3) - (6)].val.opval), (ps[(4) - (6)].val.opval), (ps[(5) - (6)].val.opval), (ps[(6) - (6)].val.opval));
-			  (yyval.opval) = Nullop;
+			  (yyval.opval) = (OP*)NULL;
 #endif
 			;}
     break;
@@ -539,12 +539,12 @@ case 2:
 
   case 69:
 #line 584 "perly.y"
-    { (yyval.opval) = Nullop; ;}
+    { (yyval.opval) = (OP*)NULL; ;}
     break;
 
   case 71:
 #line 590 "perly.y"
-    { (yyval.opval) = Nullop; ;}
+    { (yyval.opval) = (OP*)NULL; ;}
     break;
 
   case 72:
@@ -558,7 +558,7 @@ case 2:
 #line 596 "perly.y"
     { (yyval.opval) = IF_MAD(
 				    newOP(OP_NULL, 0),
-				    Nullop
+				    (OP*)NULL
 				);
 			  TOKEN_GETMAD((ps[(1) - (1)].val.i_tkval),(yyval.opval),':');
 			;}
@@ -575,7 +575,7 @@ case 2:
 #line 610 "perly.y"
     { (yyval.opval) = IF_MAD(
 				    newOP(OP_NULL, 0),
-				    Nullop
+				    (OP*)NULL
 				);
 			  TOKEN_GETMAD((ps[(1) - (1)].val.i_tkval),(yyval.opval),':');
 			;}
@@ -590,7 +590,7 @@ case 2:
 #line 620 "perly.y"
     { (yyval.opval) = IF_MAD(
 				    newOP(OP_NULL,0),
-				    Nullop
+				    (OP*)NULL
 				);
 			  PL_parser->expect = XSTATE;
 			  TOKEN_GETMAD((ps[(1) - (1)].val.i_tkval),(yyval.opval),';');
@@ -606,7 +606,7 @@ case 2:
 			  token_getmad((ps[(3) - (3)].val.i_tkval),(yyval.opval),';');
 #else
 			  package((ps[(2) - (3)].val.opval));
-			  (yyval.opval) = Nullop;
+			  (yyval.opval) = (OP*)NULL;
 #endif
 			;}
     break;
@@ -628,7 +628,7 @@ case 2:
 			      append_madprops(newMADPROP('!', MAD_PV, "", 0), (yyval.opval), 0);
 #else
 			  utilize(IVAL((ps[(1) - (7)].val.i_tkval)), (ps[(2) - (7)].val.ival), (ps[(4) - (7)].val.opval), (ps[(5) - (7)].val.opval), (ps[(6) - (7)].val.opval));
-			  (yyval.opval) = Nullop;
+			  (yyval.opval) = (OP*)NULL;
 #endif
 			;}
     break;
@@ -757,7 +757,7 @@ case 2:
   case 96:
 #line 752 "perly.y"
     { SvREFCNT_inc_simple_void(PL_compcv);
-			  (yyval.opval) = newANONATTRSUB((ps[(2) - (3)].val.ival), 0, Nullop, (ps[(3) - (3)].val.opval)); ;}
+			  (yyval.opval) = newANONATTRSUB((ps[(2) - (3)].val.ival), 0, (OP*)NULL, (ps[(3) - (3)].val.opval)); ;}
     break;
 
   case 97:
@@ -894,7 +894,7 @@ case 2:
 
   case 112:
 #line 859 "perly.y"
-    { (yyval.opval) = newSLICEOP(0, (ps[(4) - (5)].val.opval), Nullop);
+    { (yyval.opval) = newSLICEOP(0, (ps[(4) - (5)].val.opval), (OP*)NULL);
 			  TOKEN_GETMAD((ps[(1) - (5)].val.i_tkval),(yyval.opval),'(');
 			  TOKEN_GETMAD((ps[(2) - (5)].val.i_tkval),(yyval.opval),')');
 			  TOKEN_GETMAD((ps[(3) - (5)].val.i_tkval),(yyval.opval),'[');
@@ -1086,7 +1086,7 @@ case 2:
 
   case 136:
 #line 989 "perly.y"
-    { (yyval.opval) = newANONLIST(Nullop);
+    { (yyval.opval) = newANONLIST((OP*)NULL);
 			  TOKEN_GETMAD((ps[(1) - (2)].val.i_tkval),(yyval.opval),'[');
 			  TOKEN_GETMAD((ps[(2) - (2)].val.i_tkval),(yyval.opval),']');
 			;}
@@ -1103,7 +1103,7 @@ case 2:
 
   case 138:
 #line 1000 "perly.y"
-    { (yyval.opval) = newANONHASH(Nullop);
+    { (yyval.opval) = newANONHASH((OP*)NULL);
 			  TOKEN_GETMAD((ps[(1) - (3)].val.i_tkval),(yyval.opval),'{');
 			  TOKEN_GETMAD((ps[(2) - (3)].val.i_tkval),(yyval.opval),';');
 			  TOKEN_GETMAD((ps[(3) - (3)].val.i_tkval),(yyval.opval),'}');
@@ -1142,7 +1142,7 @@ case 2:
 				scalar(newCVREF(
 				    (OPpENTERSUB_AMPER<<8),
 				    scalar((ps[(2) - (4)].val.opval))
-				)),Nullop)); dep();
+				)),(OP*)NULL)); dep();
 			  TOKEN_GETMAD((ps[(1) - (4)].val.i_tkval),(yyval.opval),'o');
 			  TOKEN_GETMAD((ps[(3) - (4)].val.i_tkval),(yyval.opval),'(');
 			  TOKEN_GETMAD((ps[(4) - (4)].val.i_tkval),(yyval.opval),')');
@@ -1169,7 +1169,7 @@ case 2:
 #line 1050 "perly.y"
     { (yyval.opval) = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED,
 			    prepend_elem(OP_LIST,
-				scalar(newCVREF(0,scalar((ps[(2) - (4)].val.opval)))), Nullop)); dep();
+				scalar(newCVREF(0,scalar((ps[(2) - (4)].val.opval)))), (OP*)NULL)); dep();
 			  TOKEN_GETMAD((ps[(1) - (4)].val.i_tkval),(yyval.opval),'o');
 			  TOKEN_GETMAD((ps[(3) - (4)].val.i_tkval),(yyval.opval),'(');
 			  TOKEN_GETMAD((ps[(4) - (4)].val.i_tkval),(yyval.opval),')');
@@ -1499,7 +1499,7 @@ case 2:
 
   case 194:
 #line 1268 "perly.y"
-    { (yyval.opval) = Nullop; ;}
+    { (yyval.opval) = (OP*)NULL; ;}
     break;
 
   case 195:
@@ -1509,7 +1509,7 @@ case 2:
 
   case 196:
 #line 1274 "perly.y"
-    { (yyval.opval) = Nullop; ;}
+    { (yyval.opval) = (OP*)NULL; ;}
     break;
 
   case 197:
diff --git a/perly.y b/perly.y
index 4dac4d0dcd..ad7b55209e 100644
--- a/perly.y
+++ b/perly.y
@@ -177,7 +177,7 @@ mremember:	/* NULL */	/* start a partial lexical scope */
 
 /* A collection of "lines" in the program */
 lineseq	:	/* NULL */
-			{ $$ = Nullop; }
+			{ $$ = (OP*)NULL; }
 	|	lineseq decl
 			{
 			$$ = IF_MAD(
@@ -213,7 +213,7 @@ line	:	label cond
 			  else {
 			      $$ = IF_MAD(
 					newOP(OP_NULL, 0),
-					Nullop);
+					(OP*)NULL);
                               PL_parser->copline = NOLINE;
 			      TOKEN_FREE($1);
 			      TOKEN_GETMAD($2,$$,';');
@@ -240,7 +240,7 @@ line	:	label cond
 
 /* An expression which may have a side-effect */
 sideff	:	error
-			{ $$ = Nullop; }
+			{ $$ = (OP*)NULL; }
 	|	expr
 			{ $$ = $1; }
 	|	expr IF expr
@@ -261,14 +261,14 @@ sideff	:	error
 			}
 	|	expr FOR expr
 			{ $$ = newFOROP(0, NULL, (line_t)IVAL($2),
-					Nullop, $3, $1, Nullop);
+					(OP*)NULL, $3, $1, (OP*)NULL);
 			  TOKEN_GETMAD($2,((LISTOP*)$$)->op_first->op_sibling,'w');
 			}
 	;
 
 /* else and elsif blocks */
 else	:	/* NULL */
-			{ $$ = Nullop; }
+			{ $$ = (OP*)NULL; }
 	|	ELSE mblock
 			{ ($2)->op_flags |= OPf_PARENS; $$ = scope($2);
 			  TOKEN_GETMAD($1,$$,'o');
@@ -312,7 +312,7 @@ case	:	WHEN '(' remember mexpr ')' mblock
 
 /* Continue blocks */
 cont	:	/* NULL */
-			{ $$ = Nullop; }
+			{ $$ = (OP*)NULL; }
 	|	CONTINUE block
 			{ $$ = scope($2);
 			  TOKEN_GETMAD($1,$$,'o');
@@ -325,7 +325,7 @@ loop	:	label WHILE '(' remember texpr ')' mintro mblock cont
 			  PL_parser->copline = (line_t)$2;
 			    $$ = block_end($4,
 				   newSTATEOP(0, PVAL($1),
-				     innerop = newWHILEOP(0, 1, (LOOP*)Nullop,
+				     innerop = newWHILEOP(0, 1, (LOOP*)(OP*)NULL,
 						IVAL($2), $5, $8, $9, $7)));
 			  TOKEN_GETMAD($1,innerop,'L');
 			  TOKEN_GETMAD($2,innerop,'W');
@@ -338,7 +338,7 @@ loop	:	label WHILE '(' remember texpr ')' mintro mblock cont
 			  PL_parser->copline = (line_t)$2;
 			    $$ = block_end($4,
 				   newSTATEOP(0, PVAL($1),
-				     innerop = newWHILEOP(0, 1, (LOOP*)Nullop,
+				     innerop = newWHILEOP(0, 1, (LOOP*)(OP*)NULL,
 						IVAL($2), $5, $8, $9, $7)));
 			  TOKEN_GETMAD($1,innerop,'L');
 			  TOKEN_GETMAD($2,innerop,'W');
@@ -370,7 +370,7 @@ loop	:	label WHILE '(' remember texpr ')' mintro mblock cont
 			{ OP *innerop;
 			  $$ = block_end($4,
 			     innerop = newFOROP(0, PVAL($1), (line_t)IVAL($2),
-						    Nullop, $5, $7, $8));
+						    (OP*)NULL, $5, $7, $8));
 			  TOKEN_GETMAD($1,((LISTOP*)innerop)->op_first,'L');
 			  TOKEN_GETMAD($2,((LISTOP*)innerop)->op_first->op_sibling,'W');
 			  TOKEN_GETMAD($3,((LISTOP*)innerop)->op_first->op_sibling,'(');
@@ -382,7 +382,7 @@ loop	:	label WHILE '(' remember texpr ')' mintro mblock cont
 			{ OP *forop;
 			  PL_parser->copline = (line_t)IVAL($2);
 			  forop = newSTATEOP(0, PVAL($1),
-					    newWHILEOP(0, 1, (LOOP*)Nullop,
+					    newWHILEOP(0, 1, (LOOP*)(OP*)NULL,
 						IVAL($2), scalar($7),
 						$12, $10, $9));
 #ifdef MAD
@@ -410,8 +410,8 @@ loop	:	label WHILE '(' remember texpr ')' mintro mblock cont
 			  $$ = block_end($4, forop); }
 	|	label block cont  /* a block is a loop that happens once */
 			{ $$ = newSTATEOP(0, PVAL($1),
-				 newWHILEOP(0, 1, (LOOP*)Nullop,
-					    NOLINE, Nullop, $2, $3, 0));
+				 newWHILEOP(0, 1, (LOOP*)(OP*)NULL,
+					    NOLINE, (OP*)NULL, $2, $3, 0));
 			  TOKEN_GETMAD($1,((LISTOP*)$$)->op_first,'L'); }
 	;
 
@@ -432,7 +432,7 @@ mintro	:	/* NULL */
 
 /* Normal expression */
 nexpr	:	/* NULL */
-			{ $$ = Nullop; }
+			{ $$ = (OP*)NULL; }
 	|	sideff
 	;
 
@@ -509,13 +509,13 @@ format	:	FORMAT startformsub formname block
 			  token_free($1);
 #else
 			  newFORM($2, $3, $4);
-			  $$ = Nullop;
+			  $$ = (OP*)NULL;
 #endif
 			}
 	;
 
 formname:	WORD		{ $$ = $1; }
-	|	/* NULL */	{ $$ = Nullop; }
+	|	/* NULL */	{ $$ = (OP*)NULL; }
 	;
 
 /* Unimplemented "my sub foo { }" */
@@ -526,7 +526,7 @@ mysubrout:	MYSUB startsub subname proto subattrlist subbody
 			  token_getmad($1,$$,'d');
 #else
 			  newMYSUB($2, $3, $4, $5, $6);
-			  $$ = Nullop;
+			  $$ = (OP*)NULL;
 #endif
 			}
 	;
@@ -549,7 +549,7 @@ subrout	:	SUB startsub subname proto subattrlist subbody
 			    }
 #else
 			  newATTRSUB($2, $3, $4, $5, $6);
-			  $$ = Nullop;
+			  $$ = (OP*)NULL;
 #endif
 			}
 	;
@@ -581,13 +581,13 @@ subname	:	WORD	{ const char *const name = SvPV_nolen_const(((SVOP*)$1)->op_sv);
 
 /* Subroutine prototype */
 proto	:	/* NULL */
-			{ $$ = Nullop; }
+			{ $$ = (OP*)NULL; }
 	|	THING
 	;
 
 /* Optional list of subroutine attributes */
 subattrlist:	/* NULL */
-			{ $$ = Nullop; }
+			{ $$ = (OP*)NULL; }
 	|	COLONATTR THING
 			{ $$ = $2;
 			  TOKEN_GETMAD($1,$$,':');
@@ -595,7 +595,7 @@ subattrlist:	/* NULL */
 	|	COLONATTR
 			{ $$ = IF_MAD(
 				    newOP(OP_NULL, 0),
-				    Nullop
+				    (OP*)NULL
 				);
 			  TOKEN_GETMAD($1,$$,':');
 			}
@@ -609,7 +609,7 @@ myattrlist:	COLONATTR THING
 	|	COLONATTR
 			{ $$ = IF_MAD(
 				    newOP(OP_NULL, 0),
-				    Nullop
+				    (OP*)NULL
 				);
 			  TOKEN_GETMAD($1,$$,':');
 			}
@@ -619,7 +619,7 @@ myattrlist:	COLONATTR THING
 subbody	:	block	{ $$ = $1; }
 	|	';'	{ $$ = IF_MAD(
 				    newOP(OP_NULL,0),
-				    Nullop
+				    (OP*)NULL
 				);
 			  PL_parser->expect = XSTATE;
 			  TOKEN_GETMAD($1,$$,';');
@@ -634,7 +634,7 @@ package :	PACKAGE WORD ';'
 			  token_getmad($3,$$,';');
 #else
 			  package($2);
-			  $$ = Nullop;
+			  $$ = (OP*)NULL;
 #endif
 			}
 	;
@@ -652,7 +652,7 @@ use	:	USE startsub
 			      append_madprops(newMADPROP('!', MAD_PV, "", 0), $$, 0);
 #else
 			  utilize(IVAL($1), $2, $4, $5, $6);
-			  $$ = Nullop;
+			  $$ = (OP*)NULL;
 #endif
 			}
 	;
@@ -750,7 +750,7 @@ listop	:	LSTOP indirob argexpr /* map {...} @args or print $fh @args */
 			}
 	|	LSTOPSUB startanonsub block /* sub f(&@);   f { foo } ... */
 			{ SvREFCNT_inc_simple_void(PL_compcv);
-			  $<opval>$ = newANONATTRSUB($2, 0, Nullop, $3); }
+			  $<opval>$ = newANONATTRSUB($2, 0, (OP*)NULL, $3); }
 		    listexpr		%prec LSTOP  /* ... @bar */
 			{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
 				 append_elem(OP_LIST,
@@ -856,7 +856,7 @@ subscripted:    star '{' expr ';' '}'        /* *main::{something} */
 			  TOKEN_GETMAD($6,$$,']');
 			}
 	|	'(' ')' '[' expr ']'                 /* empty list slice! */
-			{ $$ = newSLICEOP(0, $4, Nullop);
+			{ $$ = newSLICEOP(0, $4, (OP*)NULL);
 			  TOKEN_GETMAD($1,$$,'(');
 			  TOKEN_GETMAD($2,$$,')');
 			  TOKEN_GETMAD($3,$$,'[');
@@ -986,7 +986,7 @@ anonymous:	'[' expr ']'
 			  TOKEN_GETMAD($3,$$,']');
 			}
 	|	'[' ']'
-			{ $$ = newANONLIST(Nullop);
+			{ $$ = newANONLIST((OP*)NULL);
 			  TOKEN_GETMAD($1,$$,'[');
 			  TOKEN_GETMAD($2,$$,']');
 			}
@@ -997,7 +997,7 @@ anonymous:	'[' expr ']'
 			  TOKEN_GETMAD($4,$$,'}');
 			}
 	|	HASHBRACK ';' '}'	%prec '(' /* { } (';' by tokener) */
-			{ $$ = newANONHASH(Nullop);
+			{ $$ = newANONHASH((OP*)NULL);
 			  TOKEN_GETMAD($1,$$,'{');
 			  TOKEN_GETMAD($2,$$,';');
 			  TOKEN_GETMAD($3,$$,'}');
@@ -1028,7 +1028,7 @@ termdo	:       DO term	%prec UNIOP                     /* do $filename */
 				scalar(newCVREF(
 				    (OPpENTERSUB_AMPER<<8),
 				    scalar($2)
-				)),Nullop)); dep();
+				)),(OP*)NULL)); dep();
 			  TOKEN_GETMAD($1,$$,'o');
 			  TOKEN_GETMAD($3,$$,'(');
 			  TOKEN_GETMAD($4,$$,')');
@@ -1049,7 +1049,7 @@ termdo	:       DO term	%prec UNIOP                     /* do $filename */
 	|	DO scalar '(' ')'                      /* do $subref () */
 			{ $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED,
 			    prepend_elem(OP_LIST,
-				scalar(newCVREF(0,scalar($2))), Nullop)); dep();
+				scalar(newCVREF(0,scalar($2))), (OP*)NULL)); dep();
 			  TOKEN_GETMAD($1,$$,'o');
 			  TOKEN_GETMAD($3,$$,'(');
 			  TOKEN_GETMAD($4,$$,')');
@@ -1265,13 +1265,13 @@ myterm	:	'(' expr ')'
 
 /* Basic list expressions */
 listexpr:	/* NULL */ %prec PREC_LOW
-			{ $$ = Nullop; }
+			{ $$ = (OP*)NULL; }
 	|	argexpr    %prec PREC_LOW
 			{ $$ = $1; }
 	;
 
 listexprcom:	/* NULL */
-			{ $$ = Nullop; }
+			{ $$ = (OP*)NULL; }
 	|	expr
 			{ $$ = $1; }
 	|	expr ','
diff --git a/win32/perlhost.h b/win32/perlhost.h
index b9d4e1e4ab..76e469657f 100644
--- a/win32/perlhost.h
+++ b/win32/perlhost.h
@@ -1782,7 +1782,7 @@ restart:
 	    if (PL_restartop) {
 		POPSTACK_TO(PL_mainstack);
 		PL_op = PL_restartop;
-		PL_restartop = Nullop;
+		PL_restartop = (OP*)NULL;
 		goto restart;
 	    }
 	    PerlIO_printf(Perl_error_log, "panic: restartop\n");
@@ -1794,7 +1794,7 @@ restart:
 
 	/* XXX hack to avoid perl_destruct() freeing optree */
         win32_checkTLS(my_perl);
-	PL_main_root = Nullop;
+	PL_main_root = (OP*)NULL;
     }
 
     win32_checkTLS(my_perl);