[destructuring] don't attempt to visit contents of FunctionLiterals

src/ast/ast-expression-visitor.cc

Index: src/ast/ast-expression-visitor.cc
diff --git a/src/ast/ast-expression-visitor.cc b/src/ast/ast-expression-visitor.cc
index dbf4ea463c851b2ae57447d9e2d0301e795b120b..4325ceba6969b83922c196109ad579bea888e062 100644
--- a/src/ast/ast-expression-visitor.cc
+++ b/src/ast/ast-expression-visitor.cc
@@ -31,16 +31,15 @@ namespace internal {
     if (HasStackOverflow()) return; \
   } while (false)
 
-
-AstExpressionVisitor::AstExpressionVisitor(Isolate* isolate, Expression* root)
-    : root_(root), depth_(0) {
+AstExpressionVisitor::AstExpressionVisitor(Isolate* isolate, Expression* root,
+                                           Mode mode)
+    : root_(root), depth_(0), mode_(mode) {
   InitializeAstVisitor(isolate);
 }
 
-
 AstExpressionVisitor::AstExpressionVisitor(uintptr_t stack_limit,
-                                           Expression* root)
-    : root_(root), depth_(0) {
+                                           Expression* root, Mode mode)
+    : root_(root), depth_(0), mode_(mode) {
   InitializeAstVisitor(stack_limit);
 }
 
@@ -198,6 +197,7 @@ void AstExpressionVisitor::VisitDebuggerStatement(DebuggerStatement* stmt) {}
 void AstExpressionVisitor::VisitFunctionLiteral(FunctionLiteral* expr) {
   Scope* scope = expr->scope();
   VisitExpression(expr);
+  if (is_shallow()) return;
   RECURSE_EXPRESSION(VisitDeclarations(scope->declarations()));
   RECURSE_EXPRESSION(VisitStatements(expr->body()));
 }