diff --git a/js/src/frontend/FullParseHandler.h b/js/src/frontend/FullParseHandler.h
index 49dd5c95bff..f148fbb6957 100644
--- a/js/src/frontend/FullParseHandler.h
+++ b/js/src/frontend/FullParseHandler.h
@@ -27,7 +27,6 @@ class FullParseHandler
 {
     ParseNodeAllocator allocator;
     TokenStream &tokenStream;
-    bool foldConstants;
 
     ParseNode *allocParseNode(size_t size) {
         MOZ_ASSERT(size == sizeof(ParseNode));
@@ -71,11 +70,10 @@ class FullParseHandler
     typedef Definition *DefinitionNode;
 
     FullParseHandler(ExclusiveContext *cx, LifoAlloc &alloc,
-                     TokenStream &tokenStream, bool foldConstants,
-                     Parser<SyntaxParseHandler> *syntaxParser, LazyScript *lazyOuterFunction)
+                     TokenStream &tokenStream, Parser<SyntaxParseHandler> *syntaxParser,
+                     LazyScript *lazyOuterFunction)
       : allocator(cx, alloc),
         tokenStream(tokenStream),
-        foldConstants(foldConstants),
         lazyOuterFunction_(lazyOuterFunction),
         lazyInnerFunctionIndex(0),
         syntaxParser(syntaxParser)
@@ -220,7 +218,7 @@ class FullParseHandler
     ParseNode *appendOrCreateList(ParseNodeKind kind, ParseNode *left, ParseNode *right,
                                   ParseContext<FullParseHandler> *pc, JSOp op = JSOP_NOP)
     {
-        return ParseNode::appendOrCreateList(kind, op, left, right, this, pc, foldConstants);
+        return ParseNode::appendOrCreateList(kind, op, left, right, this, pc);
     }
 
     ParseNode *newTernary(ParseNodeKind kind,
diff --git a/js/src/frontend/ParseNode.cpp b/js/src/frontend/ParseNode.cpp
index 7d491e6fd66..dacf3ff1412 100644
--- a/js/src/frontend/ParseNode.cpp
+++ b/js/src/frontend/ParseNode.cpp
@@ -246,8 +246,7 @@ ParseNodeAllocator::allocNode()
 
 ParseNode *
 ParseNode::appendOrCreateList(ParseNodeKind kind, JSOp op, ParseNode *left, ParseNode *right,
-                              FullParseHandler *handler, ParseContext<FullParseHandler> *pc,
-                              bool foldConstants)
+                              FullParseHandler *handler, ParseContext<FullParseHandler> *pc)
 {
     // The asm.js specification is written in ECMAScript grammar terms that
     // specify *only* a binary tree.  It's a royal pain to implement the asm.js
diff --git a/js/src/frontend/ParseNode.h b/js/src/frontend/ParseNode.h
index 29244cf66bd..31b548ebd05 100644
--- a/js/src/frontend/ParseNode.h
+++ b/js/src/frontend/ParseNode.h
@@ -651,8 +651,7 @@ class ParseNode
      */
     static ParseNode *
     appendOrCreateList(ParseNodeKind kind, JSOp op, ParseNode *left, ParseNode *right,
-                       FullParseHandler *handler, ParseContext<FullParseHandler> *pc,
-                       bool foldConstants);
+                       FullParseHandler *handler, ParseContext<FullParseHandler> *pc);
 
     inline PropertyName *name() const;
     inline JSAtom *atom() const;
diff --git a/js/src/frontend/Parser.cpp b/js/src/frontend/Parser.cpp
index 13195084ac2..8260516b882 100644
--- a/js/src/frontend/Parser.cpp
+++ b/js/src/frontend/Parser.cpp
@@ -516,7 +516,7 @@ Parser<ParseHandler>::Parser(ExclusiveContext *cx, LifoAlloc *alloc,
     sawDeprecatedExpressionClosure(false),
     sawDeprecatedLetBlock(false),
     sawDeprecatedLetExpression(false),
-    handler(cx, *alloc, tokenStream, foldConstants, syntaxParser, lazyOuterFunction)
+    handler(cx, *alloc, tokenStream, syntaxParser, lazyOuterFunction)
 {
     {
         AutoLockForExclusiveAccess lock(cx);
diff --git a/js/src/frontend/SyntaxParseHandler.h b/js/src/frontend/SyntaxParseHandler.h
index 1600cd9aa5b..529dd37223f 100644
--- a/js/src/frontend/SyntaxParseHandler.h
+++ b/js/src/frontend/SyntaxParseHandler.h
@@ -97,8 +97,8 @@ class SyntaxParseHandler
 
   public:
     SyntaxParseHandler(ExclusiveContext *cx, LifoAlloc &alloc,
-                       TokenStream &tokenStream, bool foldConstants,
-                       Parser<SyntaxParseHandler> *syntaxParser, LazyScript *lazyOuterFunction)
+                       TokenStream &tokenStream, Parser<SyntaxParseHandler> *syntaxParser,
+                       LazyScript *lazyOuterFunction)
       : lastAtom(nullptr),
         tokenStream(tokenStream)
     {}