added &^ and &^=

R=rsc
DELTA=14  (12 added, 0 deleted, 2 changed)
OCL=26278
CL=26348

src/lib/go/scanner.go

@@ -447,7 +447,13 @@ scan_again:
 		case '>': tok = S.switch4(token.GTR, token.GEQ, '>', token.SHR, token.SHR_ASSIGN);
 		case '=': tok = S.switch2(token.ASSIGN, token.EQL);
 		case '!': tok = S.switch2(token.NOT, token.NEQ);
-		case '&': tok = S.switch3(token.AND, token.AND_ASSIGN, '&', token.LAND);
+		case '&':
+			if S.ch == '^' {
+				S.next();
+				tok = S.switch2(token.AND_NOT, token.AND_NOT_ASSIGN);
+			} else {
+				tok = S.switch3(token.AND, token.AND_ASSIGN, '&', token.LAND);
+			}
 		case '|': tok = S.switch3(token.OR, token.OR_ASSIGN, '|', token.LOR);
 		default: S.error(loc, "illegal character " + charString(ch));
 		}

src/lib/go/scanner_test.go

@@ -76,6 +76,7 @@ var tokens = [...]elt{
 	elt{ token.XOR, "^", operator },
 	elt{ token.SHL, "<<", operator },
 	elt{ token.SHR, ">>", operator },
+	elt{ token.AND_NOT, "&^", operator },
 
 	elt{ token.ADD_ASSIGN, "+=", operator },
 	elt{ token.SUB_ASSIGN, "-=", operator },
@@ -88,6 +89,7 @@ var tokens = [...]elt{
 	elt{ token.XOR_ASSIGN, "^=", operator },
 	elt{ token.SHL_ASSIGN, "<<=", operator },
 	elt{ token.SHR_ASSIGN, ">>=", operator },
+	elt{ token.AND_NOT_ASSIGN, "&^=", operator },
 
 	elt{ token.LAND, "&&", operator },
 	elt{ token.LOR, "||", operator },

src/lib/go/token.go

@@ -40,6 +40,7 @@ const (
 	XOR;
 	SHL;
 	SHR;
+	AND_NOT;
 
 	ADD_ASSIGN;
 	SUB_ASSIGN;
@@ -52,6 +53,7 @@ const (
 	XOR_ASSIGN;
 	SHL_ASSIGN;
 	SHR_ASSIGN;
+	AND_NOT_ASSIGN;
 
 	LAND;
 	LOR;
@@ -145,6 +147,7 @@ var tokens = map [int] string {
 	XOR : "^",
 	SHL : "<<",
 	SHR : ">>",
+	AND_NOT : "&^",
 
 	ADD_ASSIGN : "+=",
 	SUB_ASSIGN : "-=",
@@ -157,6 +160,7 @@ var tokens = map [int] string {
 	XOR_ASSIGN : "^=",
 	SHL_ASSIGN : "<<=",
 	SHR_ASSIGN : ">>=",
+	AND_NOT_ASSIGN : "&^=",
 
 	LAND : "&&",
 	LOR : "||",
@@ -264,7 +268,7 @@ func Precedence(tok int) int {
 		return 4;
 	case ADD, SUB, OR, XOR:
 		return 5;
-	case MUL, QUO, REM, SHL, SHR, AND:
+	case MUL, QUO, REM, SHL, SHR, AND, AND_NOT:
 		return 6;
 	}
 	return LowestPrec;