Test for var declarations in eval which conflict with let

src/variables.h

Index: src/variables.h
diff --git a/src/variables.h b/src/variables.h
index 1c6290dff45315444b8d4e287dffabf37da035e8..a9cd5dcfec735a13ac4304252a48721cefde4c1e 100644
--- a/src/variables.h
+++ b/src/variables.h
@@ -124,6 +124,8 @@ class Variable: public ZoneObject {
     index_ = index;
   }
 
+  void SetFromEval() { is_from_eval_ = true; }
+
   static int CompareIndex(Variable* const* v, Variable* const* w);
 
   void RecordStrongModeReference(int start_position, int end_position) {
@@ -144,6 +146,16 @@ class Variable: public ZoneObject {
   int strong_mode_reference_end_position() const {
     return strong_mode_reference_end_position_;
   }
+  PropertyAttributes DeclarationPropertyAttributes() const {
+    int property_attributes = NONE;
+    if (IsImmutableVariableMode(mode_)) {
+      property_attributes |= READ_ONLY;
+    }
+    if (is_from_eval_) {
+      property_attributes |= EVAL_DECLARED;
+    }
+    return static_cast<PropertyAttributes>(property_attributes);
+  }
 
  private:
   Scope* scope_;
@@ -165,6 +177,9 @@ class Variable: public ZoneObject {
   // binding scope (exclusive).
   Variable* local_if_not_shadowed_;
 
+  // True if this variable is introduced by a sloppy eval
+  bool is_from_eval_;
+
   // Usage info.
   bool force_context_allocation_;  // set by variable resolver
   bool is_used_;