If the LHS is just `int` or `float` type, that type includes custom subclasses which can arbitrarily override division behavior, so we shouldn't emit a divide-by-zero error in those cases. Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
Markdown files within the mdtest/ subdirectory are tests of type inference and type checking;
executed by the tests/mdtest.rs integration test.
See crates/red_knot_test/README.md for documentation of this test format.