Regression in uv 0.2.16 compile with unsatisfiable constraint in extra

[hauntsaninja]

λ cat r.in
gunicorn>=20
λ cat c.in
eventlet==9999.0.1.2.3.4.5

λ uv --version
uv 0.2.15 (bfc342da9 2024-06-24)
λ uv pip compile r.in -c c.in
Resolved 2 packages in 40ms
# This file was autogenerated by uv via the following command:
#    uv pip compile r.in -c c.in
gunicorn==22.0.0
    # via -r r.in
packaging==24.1
    # via gunicorn

λ uv pip install -U uv==0.2.16
Resolved 1 package in 4ms
Uninstalled 1 package in 3ms
Installed 1 package in 4ms
 - uv==0.2.15
 + uv==0.2.16
λ uv pip compile r.in -c c.in 
  × No solution found when resolving dependencies:
  ╰─▶ Because there is no version of eventlet==9999.0.1.2.3.4.5 and gunicorn>=20.0.0 depends on eventlet==9999.0.1.2.3.4.5, we can conclude that gunicorn>=20.0.0 cannot be used.
      And because only the following versions of gunicorn are available:
          gunicorn<=20.0.0
          gunicorn==20.0.2
          gunicorn==20.0.3
          gunicorn==20.0.4
          gunicorn==20.1.0
          gunicorn==21.0.0
          gunicorn==21.0.1
          gunicorn==21.1.0
          gunicorn==21.2.0
          gunicorn==22.0.0
      and you require gunicorn>=20, we can conclude that the requirements are unsatisfiable.

[charliermarsh]

Is eventlet only a dependency of gunicorn when an extra is enabled (which isn't present)?

[hauntsaninja]

Yup exactly.
The eventlet constraint is a hacky way to ban eventlet from ending up in any lock.
gunicorn does have a dependency on eventlet, but only in the eventlet extra which we do not use

[charliermarsh]

Okay thanks. I'll try to figure this out now...

[zanieb]

Will be released in a bit: #4573

[zanieb]

@hauntsaninja btw you inspired me to make it just a little bit easier to use uv tool run for your reproduction in #4572 so you can uv tool run uv@0.2.16 ... next time :)