Using `--test-option` with an argument starting with `@` prints `?` to the screen

[brandonchinn178]

Describe the bug

When I do cabal test --test-options '@foo', cabal prints out a question mark:

$ cabal test --test-options '@foo'
"?"
Build profile: -w ghc-9.12.2 -O1

Probably comes from here, although I have no idea why it's printing out a question mark:

cabal/Cabal/src/Distribution/Compat/ResponseFile.hs

Line 36 in 9ea037b

expand n dir arg@('@' : f) = readRecursively n (dir </> f) `catchIOError` const (print "?" >> return [arg])

1. Why is a question mark being printed out?
2. Why is this running on --test-options?

To Reproduce

Expected behavior

System information

• Operating system
• cabal, ghc versions

Additional context
Add any other context about the problem here.