Constraint from non-upgradeable package requires installed instance

[LiraOnGithub]

Describe the bug
Setting the constraint of base to a different version than the one already installed results in a constraint from non-upgradeable package requires installed instance.
I have base-4.16 installed, but need base-4.15 as the package memory has a constraint base <4.16.

I made a minimal example to show it.
To Reproduce
Steps to reproduce the behavior:

$ cat test.cabal
name:                test
version:             1.0
build-type:          Simple
cabal-version:       >=1.10
executable test
  main-is:             ./Main.hs
  build-depends:       base <4.16
  hs-source-dirs:      ./
  default-language:    Haskell2010

$ cat Main.hs
module Main where

main = putStrLn "Test"

$ cabal v2-build
Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: test-1.0 (user goal)
[__1] next goal: base (dependency of test)
[__1] rejecting: base-4.16.0.0/installed-4.16.0.0 (conflict: test =>
base<4.16)
[__1] skipping: base-4.16.0.0 (has the same characteristics that caused the
previous version to fail: excluded by constraint '<4.16' from 'test')
[__1] rejecting: base-4.15.1.0, base-4.15.0.0, base-4.14.3.0, base-4.14.2.0,
base-4.14.1.0, base-4.14.0.0, base-4.13.0.0, base-4.12.0.0, base-4.11.1.0,
base-4.11.0.0, base-4.10.1.0, base-4.10.0.0, base-4.9.1.0, base-4.9.0.0,
base-4.8.2.0, base-4.8.1.0, base-4.8.0.0, base-4.7.0.2, base-4.7.0.1,
base-4.7.0.0, base-4.6.0.1, base-4.6.0.0, base-4.5.1.0, base-4.5.0.0,
base-4.4.1.0, base-4.4.0.0, base-4.3.1.0, base-4.3.0.0, base-4.2.0.2,
base-4.2.0.1, base-4.2.0.0, base-4.1.0.0, base-4.0.0.0, base-3.0.3.2,
base-3.0.3.1 (constraint from non-upgradeable package requires installed
instance)
[__1] fail (backjumping, conflict set: base, test)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, test

Please use version-prefixed commands (e.g. v2-build or v1-build) to avoid ambiguity.

Expected behavior
Package base to be loaded in a version below 4.16.

System information

• Ubuntu 20.04.3 LTS 64bit
• Cabal 3.6.2.0 and ghc 9.2.1

Additional context
The package with the base<4.16-constraint: https://hackage.haskell.org/package/memory

[Mikolaj]

Hi! Base it tightly coupled with GHC, so I'm afraid you need to pester the package maintainers to update their package, Or you can cabal get the package, bump the dependency and hope it works. Or install an additional older GHC with gchup and compile with -w nameOfOlderGHC (or set the old one as the default). Hope this helps. :)

[LiraOnGithub]

cabal run -w ghc-8.10.7 works! Thank you ^^