[issue39220] constant folding affects annotations despite 'from __future__ import annotations'

[Carl Friedrich Bolz-Tereick]

New submission from Carl Friedrich Bolz-Tereick <cfbolz at gmx.de>:

PEP 563 interacts in weird ways with constant folding. running the following code:

```
from __future__ import annotations

def f(a: 5 + 7) -> a ** 39:
    return 12

print(f.__annotations__)
```

I would expect this output:

```
{'a': '5 + 7', 'return': 'a ** 39'}
```

But I get:


```
{'a': '12', 'return': 'a ** 39'}
```

----------
components: Interpreter Core
files: x.py
messages: 359341
nosy: Carl.Friedrich.Bolz
priority: normal
severity: normal
status: open
title: constant folding affects annotations despite 'from __future__ import annotations'
versions: Python 3.7
Added file: https://bugs.python.org/file48827/x.py

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39220>
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