❯ ruff check --target-version=py314 --preview --select RUF027 Lib/test/support/__init__.py 
Lib/test/support/__init__.py:1087:26: RUF027 Possible f-string without an `f` prefix
     |
1085 |     memlimit = _parse_memlimit(limit)
1086 |     if memlimit < _2G - 1:
1087 |         raise ValueError('Memory limit {limit!r} too low to be useful')
     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ RUF027
1088 |
1089 |     real_max_memuse = memlimit
     |
     = help: Add `f` prefix

Lib/test/support/__init__.py:2361:26: RUF027 Possible f-string without an `f` prefix
     |
2359 |         max_depth = 20_000
2360 |     elif max_depth < 3:
2361 |         raise ValueError("max_depth must be at least 3, got {max_depth}")
     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ RUF027
2362 |     depth = get_recursion_depth()
2363 |     depth = max(depth - 1, 1)  # Ignore infinite_recursion() frame.
     |
     = help: Add `f` prefix

Found 2 errors.