Dependency resolver bluntly ignores version requirement and installs release candidate instead of latest stable

[ghost]

• I am on the latest Poetry version.

• I have searched the issues of this repo and believe that this is not a duplicate.

• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Ubuntu WSL on Windows 10

• Poetry version: 1.0.10 and 1.1.0b2

Issue

To reproduce:

$ poetry new test_proj
$ cd test_proj
$ poetry install
$ poetry add numba -vvv

Result

PyPI: 75 packages found for numba *
Using version ^0.50.1 for numba

Updating dependencies
Resolving dependencies...
   1: fact: test-proj is 0.1.0
   1: derived: test-proj
   1: fact: test-proj depends on numba (^0.50.1)
   1: fact: test-proj depends on pytest (^5.2)
   1: fact: test-proj depends on pytest (^5.2)
   1: selecting test-proj (0.1.0)
   1: derived: pytest (^5.2)
   1: derived: numba (^0.50.1)
   1: fact: pytest (5.4.3) depends on py (>=1.5.0)
   1: fact: pytest (5.4.3) depends on packaging (*)
   1: fact: pytest (5.4.3) depends on attrs (>=17.4.0)
   1: fact: pytest (5.4.3) depends on more-itertools (>=4.0.0)
   1: fact: pytest (5.4.3) depends on pluggy (>=0.12,<1.0)
   1: fact: pytest (5.4.3) depends on wcwidth (*)
   1: fact: pytest (5.4.3) depends on importlib-metadata (>=0.12)
   1: fact: pytest (5.4.3) depends on atomicwrites (>=1.0)
   1: fact: pytest (5.4.3) depends on colorama (*)
   1: selecting pytest (5.4.3)
   1: derived: colorama (*)
   1: derived: atomicwrites (>=1.0)
   1: derived: importlib-metadata (>=0.12)
   1: derived: wcwidth (*)
   1: derived: pluggy (>=0.12,<1.0)
   1: derived: more-itertools (>=4.0.0)
   1: derived: attrs (>=17.4.0)
   1: derived: packaging (*)
   1: derived: py (>=1.5.0)
PyPI: 1 packages found for numba >=0.50.1,<0.51.0
   1: fact: numba (0.50.1) depends on llvmlite (>=0.33.0.dev0,<0.34)
   1: fact: numba (0.50.1) depends on numpy (>=1.15)
   1: selecting numba (0.50.1)
   1: derived: numpy (>=1.15)
   1: derived: llvmlite (>=0.33.0.dev0,<0.34)
PyPI: No release information found for numpy-0.9.6, skipping
PyPI: No release information found for numpy-0.9.8, skipping
PyPI: No release information found for numpy-1.0.3, skipping
PyPI: No release information found for numpy-1.0.4, skipping
PyPI: No release information found for numpy-1.0b1, skipping
PyPI: No release information found for numpy-1.0b4, skipping
PyPI: No release information found for numpy-1.0b5, skipping
PyPI: No release information found for numpy-1.0rc1, skipping
PyPI: No release information found for numpy-1.0rc2, skipping
PyPI: No release information found for numpy-1.0rc3, skipping
PyPI: No release information found for numpy-1.1.1, skipping
PyPI: No release information found for numpy-1.2.0, skipping
PyPI: No release information found for numpy-1.2.1, skipping
PyPI: No release information found for numpy-1.4.0, skipping
PyPI: 26 packages found for numpy >=1.15
PyPI: No release information found for llvmlite-0.1, skipping
PyPI: 3 packages found for llvmlite >=0.33.0.dev0,<0.34
   1: selecting colorama (0.4.3)
   1: selecting atomicwrites (1.4.0)
   1: fact: importlib-metadata (1.7.0) depends on zipp (>=0.5)
   1: selecting importlib-metadata (1.7.0)
   1: derived: zipp (>=0.5)
   1: selecting wcwidth (0.2.5)
   1: fact: pluggy (0.13.1) depends on importlib-metadata (>=0.12)
   1: selecting pluggy (0.13.1)
   1: selecting more-itertools (8.4.0)
   1: selecting attrs (19.3.0)
   1: fact: packaging (20.4) depends on pyparsing (>=2.0.2)
   1: fact: packaging (20.4) depends on six (*)
   1: selecting packaging (20.4)
   1: derived: six (*)
   1: derived: pyparsing (>=2.0.2)
   1: selecting py (1.9.0)
   1: selecting zipp (3.1.0)
   1: selecting six (1.15.0)
   1: selecting pyparsing (2.4.7)
   1: selecting llvmlite (0.34.0rc1)
   1: selecting numpy (1.19.1)
   1: Version solving took 0.262 seconds.
   1: Tried 1 solutions.

Writing lock file


Package operations: 3 installs, 0 updates, 0 removals

  - Installing llvmlite (0.34.0rc1)
  - Installing numpy (1.19.1)
  - Installing numba (0.50.1)

It is clear for the numba requirements that llvmlite should be <0.34, but the resolver still chooses 0.34.0rc1.

That's wrong and my code cannot run because of this.

[ghost]

Duplicate from #2271 (my bad)

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