ghc: panic using --enable-executable-dynamic

(from: https://github.com/haskell/cabal/issues/2039)

Using --enable-executable-dynamic leads to a ghc panic.

Reproduction steps:

1. git clone https://github.com/coreyoconnor/executable-dynamic-issue
2. cabal configure --enable-tests --enable-executable-dynamic
3. cabal test

Expected results: Test executes and passes.

Actual results:

ghc: panic! (the 'impossible' happened) (GHC version 7.8.2 for x86_64-unknown-linux): Don't understand library name verify-foo

Actual results varies based on the name of "verify-foo" test suite. Other names tried: "verifyFoo", "VerifyFoo". All of which also fail.

Removing "--enable-executable-dynamic" results in a pass regardless of test suite name.

Reproduced on GHC 7.8.2, GHC 7.8.3, Cabal 1.18, Cabal 1.20. Ubuntu.