error

What it does

Checks for ty: ignore[code] or type: ignore[ty:code] comments where code isn't a known lint rule.

Why is this bad?

A ty: ignore[code] or a type: ignore[ty:code] directive with a code that doesn't match any known rule will not suppress any type errors, and is probably a mistake.

Examples

# error
a = 20 / 1  # ty: ignore[division-by-zer]

Use instead:

a = 20 / 0  # ty: ignore[division-by-zero]