[es6] Sloppy functions in block

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index 753391193bf03667a685a24161b83e53ca3ecbda..65b4d7ee896026a780e4342588d00f5335db7549 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -2217,6 +2217,28 @@ Statement* Parser::ParseFunctionDeclaration(
       factory()->NewFunctionDeclaration(proxy, mode, fun, scope_, pos);
   Declare(declaration, DeclarationDescriptor::NORMAL, true, CHECK_OK);
   if (names) names->Add(name, zone());
+
+  // For sloppy function in block we also add a var binding that gets assigned
+  // to at the location of the FunctionDeclaration -- but only if introducing
+  // this var binding does not lead to an early error.
+  if (is_sloppy(language_mode()) && scope_->is_block_scope() &&
+      allow_harmony_sloppy()) {
+    VariableProxy* var_proxy = NewUnresolved(name, VAR);
+    Declaration* declaration =
+        factory()->NewVariableDeclaration(var_proxy, VAR, scope_, pos);
+    bool var_ok = true;
+    Declare(declaration, DeclarationDescriptor::NORMAL, true, &var_ok);
+    if (!var_ok) {
+      scope_->RemoveUnresolved(var_proxy);
+    } else {
+      // At the location of the FunctionDeclaration we assign to the var
+      // binding.
+      Assignment* assignment = factory()->NewAssignment(
+          Token::ASSIGN, var_proxy, NewUnresolved(name, mode), pos);
+      return factory()->NewExpressionStatement(assignment,
+                                               RelocInfo::kNoPosition);
+    }
+  }
   return factory()->NewEmptyStatement(RelocInfo::kNoPosition);
 }