ImportError while loading conftest '/workspace/jinja/tests/conftest.py'.
tests/conftest.py:5: in <module>
    from jinja2 import loaders
src/jinja2/__init__.py:9: in <module>
    from .environment import Environment as Environment
src/jinja2/environment.py:15: in <module>
    from .compiler import CodeGenerator
src/jinja2/compiler.py:28: in <module>
    def _make_unop(op: str) -> t.Callable[['CodeGenerator', nodes.UnaryExpr, Frame], None]:
E   NameError: name 'Frame' is not defined