New submission from Nikita Sobolev <[email protected]>:
Right now if I remove these lines:
```python
if parameters == ():
raise TypeError("Cannot take a Concatenate of no types.")
if not isinstance(parameters, tuple):
parameters = (parameters,)
if not isinstance(parameters[-1], ParamSpec):
raise TypeError("The last parameter to Concatenate should be a "
"ParamSpec variable.")
```
from here:
https://github.com/python/cpython/blob/09087b8519316608b85131ee7455b664c00c38d2/Lib/typing.py#L601-L607
And run the test suite - it passes.
To increase coverage I plan to:
1. Add a test for empty `Concatenate[]`
2. Add a test case when `ParamSpec` is not the last item of `Concatenate`
3. When passed parameter to `Concatenate` is not `tuple`
PR is on its way :)
----------
components: Tests
messages: 410682
nosy: sobolevn
priority: normal
severity: normal
status: open
title: Invalid usage of `Concatenate` is not covered at all
type: behavior
versions: Python 3.11
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Python tracker <[email protected]>
<https://bugs.python.org/issue46396>
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