[strong] Fix scoping related errors for methods.

src/scopes.h

Index: src/scopes.h
diff --git a/src/scopes.h b/src/scopes.h
index 186530ceab2ef134b2384ef32e5b9b588ecc182e..284386d854749e375f2b5ad6751fe57ff6a8b73f 100644
--- a/src/scopes.h
+++ b/src/scopes.h
@@ -73,7 +73,8 @@ class Scope: public ZoneObject {
   // Construction
 
   Scope(Zone* zone, Scope* outer_scope, ScopeType scope_type,
-        AstValueFactory* value_factory);
+        AstValueFactory* value_factory,
+        FunctionKind function_kind = kNormalFunction);
 
   // Compute top scope and allocate variables. For lazy compilation the top
   // scope only contains the single lazily compiled function, so this
@@ -88,7 +89,7 @@ class Scope: public ZoneObject {
     scope_name_ = scope_name;
   }
 
-  void Initialize(bool subclass_constructor = false);
+  void Initialize();
 
   // Checks if the block scope is redundant, i.e. it does not contain any
   // block scoped declarations. In that case it is removed from the scope
@@ -281,6 +282,13 @@ class Scope: public ZoneObject {
   bool is_block_scope() const { return scope_type_ == BLOCK_SCOPE; }
   bool is_with_scope() const { return scope_type_ == WITH_SCOPE; }
   bool is_arrow_scope() const { return scope_type_ == ARROW_SCOPE; }
+  void tag_as_class_scope() {
+    DCHECK(is_block_scope());
+    block_scope_is_class_scope_ = true;
+  }
+  bool is_class_scope() const {
+    return is_block_scope() && block_scope_is_class_scope_;
+  }
   bool is_declaration_scope() const {
     return is_eval_scope() || is_function_scope() ||
         is_module_scope() || is_script_scope();
@@ -332,6 +340,8 @@ class Scope: public ZoneObject {
   // The type of this scope.
   ScopeType scope_type() const { return scope_type_; }
 
+  FunctionKind function_kind() const { return function_kind_; }
+
   // The language mode of this scope.
   LanguageMode language_mode() const { return language_mode_; }
 
@@ -501,6 +511,10 @@ class Scope: public ZoneObject {
 
   // The scope type.
   ScopeType scope_type_;
+  // Some block scopes are tagged as class scopes.
+  bool block_scope_is_class_scope_;
+  // If the scope is a function scope, this is the function kind.
+  FunctionKind function_kind_;
 
   // Debugging support.
   const AstRawString* scope_name_;
@@ -658,6 +672,12 @@ class Scope: public ZoneObject {
   bool ResolveVariablesRecursively(CompilationInfo* info,
                                    AstNodeFactory* factory);
 
+  bool CheckStrongModeDeclaration(VariableProxy* proxy, Variable* var);
+
+  // If this scope is a method scope of a class, return the corresponding
+  // class variable, otherwise nullptr.
+  Variable* ClassVariableForMethod() const;
+
   // Scope analysis.
   void PropagateScopeInfo(bool outer_scope_calls_sloppy_eval);
   bool HasTrivialContext() const;
@@ -703,9 +723,9 @@ class Scope: public ZoneObject {
     }
   }
 
-  void SetDefaults(ScopeType type,
-                   Scope* outer_scope,
-                   Handle<ScopeInfo> scope_info);
+  void SetDefaults(ScopeType type, Scope* outer_scope,
+                   Handle<ScopeInfo> scope_info,
+                   FunctionKind function_kind = kNormalFunction);
 
   AstValueFactory* ast_value_factory_;
   Zone* zone_;