FIX: Conversion of bitset to binary does not count with complement bitset state

fixes: Oldes/Rebol-issues#2436

Author: Oldes

src/core/t-bitset.c

@@ -31,8 +31,6 @@
 
 #define MAX_BITSET 0x7fffffff
 
-#define BITS_NOT(s) ((s)->size)
-
 // use if you want compatibility with R3-alpha for returning NONE on non existing bit
 // #define PICK_BITSET_AS_NONE
 

src/core/t-string.c

@@ -249,7 +249,11 @@ static REBSER *make_binary(REBVAL *arg, REBOOL make)
 
 	// MAKE/TO BINARY! <bitset!>
 	case REB_BITSET:
-		ser = Copy_Bytes(VAL_BIN(arg), VAL_TAIL(arg));
+		if(VAL_BITSET_NOT(arg)) {
+			ser = Complement_Binary(arg);
+		} else {
+			ser = Copy_Bytes(VAL_BIN(arg), VAL_TAIL(arg));
+		}
 		break;
 
 	// MAKE/TO BINARY! <image!>

src/include/sys-value.h

@@ -698,7 +698,9 @@ typedef struct Reb_Series_Ref
 **
 ***********************************************************************/
 
-#define	VAL_BITSET(v)	VAL_SERIES(v)
+#define BITS_NOT(s)        ((s)->size)
+#define	VAL_BITSET(v)      VAL_SERIES(v)
+#define	VAL_BITSET_NOT(v)  BITS_NOT(VAL_SERIES(v))
 
 #define	VAL_BIT_DATA(v)	VAL_BIN(v)
 

src/tests/units/bitset-test.r3

@@ -273,7 +273,14 @@
 	--test-- "issue-1271"
 	;@@ https://github.com/Oldes/Rebol-issues/issues/1271
 		chars: complement charset "ther "
-		--assert "it goes" = find "there it goes" chars  
+		--assert "it goes" = find "there it goes" chars
+
+	--test-- "to-binary bitset"
+	;@@ https://github.com/Oldes/Rebol-issues/issues/2436
+		bits: make bitset!  [1]
+		--assert #{40} = to binary! bits
+		--assert #{BF} = to binary! complement bits
+		--assert #{BF} = complement to binary! bits
 
 
 ===end-group===