Fix argument definition test (issue 4888).

runtime/vm/scopes.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/scopes.h"
 
 #include "vm/ast.h"
 #include "vm/bit_vector.h"
 #include "vm/object.h"
 #include "vm/parser.h"
@@ skipping 459 matching lines @@
       context_scope.SetContextLevelAt(captured_idx, adjusted_context_level);
       captured_idx++;
     }
   }
   ASSERT(context_scope.num_variables() == captured_idx);  // Verify count.
   return context_scope.raw();
 }
 
 
 LocalScope* LocalScope::RestoreOuterScope(const ContextScope& context_scope) {
-  LocalScope* outer_scope = new LocalScope(NULL, 0, 0);
+  // The function level of the outer scope is one less than the function level
+  // of the current function, which is 0.
+  LocalScope* outer_scope = new LocalScope(NULL, -1, 0);
   // Add all variables as aliases to the outer scope.
   for (int i = 0; i < context_scope.num_variables(); i++) {
     LocalVariable* variable =
         new LocalVariable(context_scope.TokenIndexAt(i),
                           String::ZoneHandle(context_scope.NameAt(i)),
                           AbstractType::ZoneHandle(context_scope.TypeAt(i)));
     variable->set_is_captured();
     variable->set_index(context_scope.ContextIndexAt(i));
     if (context_scope.IsFinalAt(i)) {
       variable->set_is_final();
@@ skipping 58 matching lines @@
   } else {
     // Shift negative indexes so that the lowest one is 0 (they are still
     // non-positive).
     return fixed_parameter_count -
         (index() - ParsedFunction::kFirstLocalSlotIndex);
   }
 }
 
 
 }  // namespace dart