This patch removes check lines from a test input. It was originally
copied from a test that had assertions automatically generated, but
given we only use it as an input, the check lines do absolutely nothing.
Remove them to improve readability of the test/prevent confusion.
This reverts commit c3776c11c26e5c0e27b772e6694e6c76f73ac9e8.
This relands commit a959d70eb5b6d47c0b32eb34fc409e50c01d722d.
This was originally causing bot failures on Python version 3.8.
This relanding fixes that by adjusting the relevant type annotations
that are not supported in earlier versions.
