[Haskell-cafe] Re: Weird ghci behaviour?
cdsmith at twu.net
Mon Nov 12 16:41:55 EST 2007
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.
This is not new with GHC 6.8. For example, it's why I had to sneakily
add a module declaration to the top of a source file when I wrote
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