Bug Report

Mypy reports a strange type error when callingbytes(filter(...)) like below.

Write the following contents to a file and run mypy:

f = filter(lambda ch: chr(ch), b"hello")bytes(f)bytes(filter(lambda ch: chr(ch), b"hello"))

Mypy reports an error on line 4 but not on lines 1/2, despite the two sections being functionally identical. The expected result is that there should be no errors in this code example.

> mypy /tmp/test.py/tmp/test.py:4: error: Argument 1 to "chr" has incompatible type "SupportsIndex"; expected "int"Found 1 error in 1 file (checked 1 source file)

Your Environment

• Mypy version used: mypy 0.931
• Mypy command-line flags: none
• Mypy configuration options frommypy.ini (and other config files): none
• Python version used: python 3.10.2
• Operating system and version: Arch linux and windows 10