REPL does not work properly until load or reload file second time

[geraldus]

I had very limited interaction with REPL in past, but getting to use it more now. Usually loading file with haskell-process-load-or-reload works correctly only first time, if I'll modify source and reload it REPL does not work. For example, loaded modules are unavailable (<interactive>:1:1: Not in scope: …), or main action could not be run:

λ> main
Too late for parseStaticFlags: call it before runGhc or runGhcT
*** Exception: ExitFailure 1

To resolve this I have to simply reload file once again without any modifications, after that everything work. I don't know is it some recent breakage or old bug. I've faced this issue with single haskell files and with cabal projects too.

Any thoughts?

[geraldus]

One thing I should mention, I'm currently using GHC version 7.10.1.

[ivan-m]

Is this with just plain ghci or with cabal? I haven't seen anything like this when using cabal + sandboxes before.

(btw, you probably want to use :main rather than main: the former acts more like you're running it on the command line, which makes a difference if you want to test parsing in command-line arguments, etc.)

[geraldus]

Is this with just plain ghci or with cabal?

I've faced this issue with single haskell files and with cabal projects too.

So, this behaviour was spotted both with ghci and cabal-repl process types.

Thank you for notice about main!

[geraldus]

I think this is not relevant now.