[Haskell-cafe] command substitution in ghci?

In a ghci session, I have an IO action that returns a file name, and then I want to :script that file. (The action could also be made to return the contents.) Cf. Bash has $(foo) to allow the output of a command to replace the command itself. See Bash manual 3.5.4 "Command Substitution" - $(command) and $(< file). We do have a work-around, since this is being called from an elisp program. This is just about a micro-optimisation of not calling ghci twice. https://github.com/tidalcycles/Tidal/issues/743 And the whole thing is a work-around for ghc and ghc-pkg not agreeing on the use of environment files (I think) - J.