--enable-multi-repl errors with multi-out-25793/paths does not exist

[philderbeast]

Describe the bug
Within this project at 62073c9, I tried bringing up a REPL with tar as the TARGET and followed instructions for multiple components but that ultimately lead to a "No such file or directory" error:

To Reproduce

$ git rev-parse HEAD
62073c99833111dc7369dd22524f3b2a250a5f1d

$ cabal install cabal-install:exe:cabal --overwrite-policy=always

$ cabal repl tar
...
Configuration is affected by the following files:
- cabal.project
Resolving dependencies...
Error: [Cabal-7076]
Cannot open a repl for multiple components at once. The target 'tar' refers to the package tar
which includes the libraries tar-internal and tar.

Your compiler supports a multiple component repl but support is not enabled.
The experimental multi repl can be enabled by
  * Globally: Setting multi-repl: True in your .cabal/config
  * Project Wide: Setting multi-repl: True in your cabal.project file
  * Per Invocation: By passing --enable-multi-repl when starting the repl

$ cabal repl tar --enable-multi-repl
Warning: this is a debug build of cabal-install with assertions enabled.
Configuration is affected by the following files:
- cabal.project
Resolving dependencies...
/.../dist-newstyle/multi-out-25793/paths:
getDirectoryContents:openDirStream: does not exist (No such file or directory)

$ ls dist-newstyle
build/  cache/  tmp/

Expected behavior
Either a warning or error to say that it is not possible to bring up a REPL for tar or for the REPL with --enable-multi-repl to come up. I also think the suggestion about multiple components could say (as another option) that the user could choose to bring up a REPL for just one of the components.

System information

$ ghc --numeric-version
9.10.1

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 24.10
Release:	24.10
Codename:	oracular

[ulysses4ever]

Again, this is a variant of #7963 but with the multi-repl twist. Why are you trying to repl unrelated packages? This was never meant to work, and you're supposed to use --build-depends. The only issue is that cabal doesn't error in a nice way, as discussed in #7963

Since this involves multi-repl, I'm hesitant whether it should be closed or not.

[philderbeast]

From #7963, trying --build-depends leaks fake-package-0 and doesn't bring up a REPL:

$ cabal repl --build-depends tar
...
- cabal.project
Error: [Cabal-7076]
Internal error when trying to open a repl for the package fake-package-0. The package is
not in the set of available targets for the project plan, which would suggest an inconsistency
between readTargetSelectors and resolveTargets.

$ cabal repl --build-depends network-uri
...
Configuration is affected by the following files:
- cabal.project
Error: [Cabal-7076]
Internal error when trying to open a repl for the package fake-package-0. The package is
not in the set of available targets for the project plan, which would suggest an inconsistency
between readTargetSelectors and resolveTargets.

[philderbeast]

Why are you trying to repl unrelated packages?

I'm testing cabal-install:exe:cabal to see how it responds to using a dependency as the target of the repl command.

[ulysses4ever]

I believe --build-depends is meant to be used outside a project context. So, cabal repl --ignore-project --build-depends tar seems to work.