[issue44825] node.annotation is not a str in `ast`'s `class _Unparser(NodeVisitor)`

[Samuel Marks]

Samuel Marks <samuelmarks at gmail.com> added the comment:

Hmm, debugging my test and I was able to replicate it with this smaller one:

```
from ast import FunctionDef, arguments, Load, Name, AnnAssign, Store, BinOp, Add, unparse
unparse(FunctionDef(args=arguments(args=[],
                       defaults=[],
                       kw_defaults=[],
                       kwarg=None,
                       kwonlyargs=[],
                       posonlyargs=[],
                       vararg=None),
        body=[AnnAssign(annotation='int',
                        simple=1,
                        target=Name(ctx=Store(),
                                    id='res'),
                        value=BinOp(left=Name(ctx=Load(),
                                              id='a'),
                                    op=Add(),
                                    right=Name(ctx=Load(),
                                               id='b')))],
        decorator_list=[],
        name='sum',
        returns=None,
        lineno=None,
        type_comment=None))
```

Which for some reason has made the `annotation` a `str` rather than `Name`. So I think it's my bug then?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44825>
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