null can also be a property key

Author: MJKWoolnough

ast_class.go

@@ -730,7 +730,7 @@ func (pn *PropertyName) parse(j *jsParser, yield, await bool) error {
 		if !j.AcceptToken(parser.Token{Type: TokenPunctuator, Data: "]"}) {
 			return j.Error("PropertyName", ErrMissingClosingBracket)
 		}
-	} else if j.Accept(TokenIdentifier, TokenKeyword, TokenStringLiteral, TokenNumericLiteral, TokenBooleanLiteral) {
+	} else if j.Accept(TokenIdentifier, TokenKeyword, TokenStringLiteral, TokenNumericLiteral, TokenBooleanLiteral, TokenNullLiteral) {
 		pn.LiteralPropertyName = j.GetLastToken()
 	} else {
 		return j.Error("PropertyName", ErrInvalidPropertyName)

ast_class_test.go

@@ -4175,26 +4175,38 @@ func TestPropertyName(t *testing.T) {
 			}
 		}},
 		{`null`, func(t *test, tk Tokens) { // 9
+			t.Output = PropertyName{
+				LiteralPropertyName: &tk[0],
+				Tokens:              tk[:1],
+			}
+		}},
+		{`"null"`, func(t *test, tk Tokens) { // 10
+			t.Output = PropertyName{
+				LiteralPropertyName: &tk[0],
+				Tokens:              tk[:1],
+			}
+		}},
+		{`/a/`, func(t *test, tk Tokens) { // 11
 			t.Err = Error{
 				Err:     ErrInvalidPropertyName,
 				Parsing: "PropertyName",
 				Token:   tk[0],
 			}
 		}},
-		{`[a, b]`, func(t *test, tk Tokens) { // 10
+		{`[a, b]`, func(t *test, tk Tokens) { // 12
 			t.Err = Error{
 				Err:     ErrMissingClosingBracket,
 				Parsing: "PropertyName",
 				Token:   tk[2],
 			}
 		}},
-		{`await`, func(t *test, tk Tokens) { // 11
+		{`await`, func(t *test, tk Tokens) { // 13
 			t.Output = PropertyName{
 				LiteralPropertyName: &tk[0],
 				Tokens:              tk[:1],
 			}
 		}},
-		{"[ // A\n\n// B\na // C\n\n// D\n]", func(t *test, tk Tokens) { // 12
+		{"[ // A\n\n// B\na // C\n\n// D\n]", func(t *test, tk Tokens) { // 14
 			t.Output = PropertyName{
 				ComputedPropertyName: &AssignmentExpression{
 					ConditionalExpression: WrapConditional(&MemberExpression{

ast_test.go

@@ -1754,7 +1754,7 @@ func TestObjectBindingPattern(t *testing.T) {
 				Token:   tk[6],
 			}
 		}},
-		{"{\nnull\n}", func(t *test, tk Tokens) { // 7
+		{"{\n/a/\n}", func(t *test, tk Tokens) { // 7
 			t.Err = Error{
 				Err: Error{
 					Err: Error{
@@ -1914,7 +1914,7 @@ func TestBindingProperty(t *testing.T) {
 				Token:   tk[0],
 			}
 		}},
-		{`null`, func(t *test, tk Tokens) { // 2
+		{`/a/`, func(t *test, tk Tokens) { // 2
 			t.Err = Error{
 				Err: Error{
 					Err:     ErrInvalidPropertyName,