Add a new innermost scope for the duration of the with block.

        Args:
            new_scope (dict-like): The scope to add.

def new_scope(self, new_scope={}):
        """Add a new innermost scope for the duration of the with block.

        Args:
            new_scope (dict-like): The scope to add.
        """
        old_scopes, self.scopes = self.scopes, self.scopes.new_child(new_scope)
        yield
        self.scopes = old_scopes