docs: def visit_Identifier(self, node):
          """Mangle names."""
          if not self._is_mangle_candidate(node):
              return
          name = node.value
          symbol = node.scope.resolve(node.value)
          if symbol is None:
              return
          mangled = symbol.scope.mangled.get(name)
          if mangled is not None:
              node.value = mangled