missing-argument when expanding a tuple

[PetterS]

Summary

Example code:

import random

def test(r: tuple[int, int]):
    x = random.randint(*r)
    print(x)

ty 0.0.1-alpha.15 (0369a3598 2025-07-18) says

error[missing-argument]: No arguments provided for required parameters `a`, `b` of bound method `randint`
 --> ty_test.py:4:9
  |
3 | def test(r: tuple[int, int]):
4 |     x = random.randint(*r)
  |         ^^^^^^^^^^^^^^^^^^
5 |     print(x)
  |
info: rule `missing-argument` is enabled by default

Interestingly, this works in the playground, but I'm not sure exactly which version is running there..

Version

0.0.1-alpha.15 (0369a35 2025-07-18)

[dcreager]

Thanks for your report!

This was just fixed in astral-sh/ruff#18996. It works in the playground because the playground runs the last main branch from the ty repo, so it already incorporated the fix. A new version is literally moments away, and should resolve this for you!

[sharkdp]

Can confirm that this is fixed in 0.0.1-alpha.16:

▶ uvx ty --version                   
ty 0.0.1-alpha.16

~                                                                                                                                           
▶ uvx ty check test.py               
WARN ty is pre-release software and not ready for production use. Expect to encounter bugs, missing features, and fatal errors.
All checks passed!

[PetterS]

Cheers!