[Haskell-cafe] Re: Weird ghci behaviour?

[Henning Thielemann]

On Mon, 12 Nov 2007, Chris Smith wrote:

> Dan Piponi wrote:
> > Several months late I now have a simple test case for what I think is
> > either a GHC bug or a "misexpectation" on my part.
>
> Here's what it looks like to me.
>
> If there is a .hi and .o file sitting around for a module, then GHCi
> will load it in compiled mode, and only let you access those symbols
> that are exported by the .hi file.  If you compile a source file that
> has no module header, it compiles to the module Main and *only* exports
> the symbol main.  You can fix it by adding a module header explicitly,
> or by deleting either the .hi or .o file.

See
  http://www.haskell.org/ghc/docs/latest/html/users_guide/interactive-evaluation.html