[ast/parsing] Pessimistically assume all top-level variables will be assigned.

test/cctest/test-parsing.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3507 matching lines @@
 
 TEST(MaybeAssignedTopLevel) {
   i::Isolate* isolate = CcTest::i_isolate();
   i::HandleScope scope(isolate);
   LocalContext env;
   i::Factory* factory = isolate->factory();
 
   const char* prefixes[] = {
       "let foo; ",          "let foo = 0; ",
       "let [foo] = [1]; ",  "let {foo} = {foo: 2}; ",
-      "let {foo=3} = {}; ",
+      "let {foo=3} = {}; ", "function foo() {}; ",
+      "var foo; ",          "var foo = 0; ",
+      "var [foo] = [1]; ",  "var {foo} = {foo: 2}; ",
+      "var {foo=3} = {}; ", "function* foo() {}; ",
   };
   const char* sources[] = {
       "function bar() {foo = 42}; ext(bar); ext(foo)",
       "ext(function() {foo++}); ext(foo)",
       "bar = () => --foo; ext(bar); ext(foo)",
       "function* bar() {eval(ext)}; ext(bar); ext(foo)",
   };
 
   for (unsigned i = 0; i < arraysize(prefixes); ++i) {
     const char* prefix = prefixes[i];
@@ skipping 5429 matching lines @@
       DCHECK_NULL(scope->sibling());
       DCHECK(scope->is_function_scope());
       const i::AstRawString* var_name =
           info.ast_value_factory()->GetOneByteString("my_var");
       i::Variable* var = scope->Lookup(var_name);
       CHECK_EQ(inners[i].ctxt_allocate,
                i::ScopeTestHelper::MustAllocateInContext(var));
     }
   }
 }