3 files changed, 19 insertions, 1 deletions
diff --git a/js/src/frontend/FullParseHandler.h b/js/src/frontend/FullParseHandler.h
index e27b9f540a..d2c8bbc2df 100644
--- a/js/src/frontend/FullParseHandler.h
+++ b/js/src/frontend/FullParseHandler.h
@@ -965,6 +965,10 @@ FOR_EACH_PARSENODE_SUBCLASS(DECLARE_AS)
         return node->isKind(PNK_NAME);
     }
 
+    bool isPrivateName(Node node) {
+        return node->isKind(PNK_NAME) && node->as<NameNode>().isPrivateName();
+    }
+
     bool isArgumentsAnyParentheses(Node node, ExclusiveContext* cx) {
         return node->isKind(PNK_NAME) && node->as<NameNode>().atom() == cx->names().arguments;
     }
diff --git a/js/src/frontend/ParseNode.h b/js/src/frontend/ParseNode.h
index b1fcab0735..439a6d8937 100644
--- a/js/src/frontend/ParseNode.h
+++ b/js/src/frontend/ParseNode.h
@@ -953,6 +953,10 @@ class NameNode : public ParseNode
     JSAtom* atom() const {
         return pn_u.name.atom;
     }
+    
+    bool isPrivateName() const {
+        return atom()->asPropertyName()->latin1OrTwoByteChar(0) == '#';
+    }
 
     ParseNode* initializer() const {
         return pn_u.name.initOrStmt;
diff --git a/js/src/frontend/SyntaxParseHandler.h b/js/src/frontend/SyntaxParseHandler.h
index 818530cfe9..80ca13ce45 100644
--- a/js/src/frontend/SyntaxParseHandler.h
+++ b/js/src/frontend/SyntaxParseHandler.h
@@ -104,6 +104,9 @@ class SyntaxParseHandler
         // Node representing the "async" name, which may actually be a
         // contextual keyword.
         NodePotentialAsyncKeyword,
+        
+        // Node representing a private name. Handled mostly like NodeUnparenthesizedName. 
+        NodePrivateName,
 
         // Valuable for recognizing potential destructuring patterns.
         NodeUnparenthesizedArray,
@@ -212,6 +215,8 @@ FOR_EACH_PARSENODE_SUBCLASS(DECLARE_AS)
             return NodePotentialAsyncKeyword;
         if (name == cx->names().eval)
             return NodeUnparenthesizedEvalName;
+        if (name->length() >= 1 && name->latin1OrTwoByteChar(0) == '#')
+            return NodePrivateName;
         return NodeUnparenthesizedName;
     }
 
@@ -614,7 +619,8 @@ FOR_EACH_PARSENODE_SUBCLASS(DECLARE_AS)
         return node == NodeUnparenthesizedArgumentsName ||
                node == NodeUnparenthesizedEvalName ||
                node == NodeUnparenthesizedName ||
-               node == NodePotentialAsyncKeyword;
+               node == NodePotentialAsyncKeyword ||
+               node == NodePrivateName;
     }
 
     bool isNameAnyParentheses(Node node) {
@@ -625,6 +631,10 @@ FOR_EACH_PARSENODE_SUBCLASS(DECLARE_AS)
                node == NodeParenthesizedName;
     }
 
+    bool isPrivateName(Node node) {
+        return node == NodePrivateName;
+    }
+
     bool isArgumentsAnyParentheses(Node node, ExclusiveContext* cx) {
         return node == NodeUnparenthesizedArgumentsName || node == NodeParenthesizedArgumentsName;
     }