#2371: `ghci` prints confusing error message if using ":m +" instead of ":load"
------------------------+---------------------------------------------------
Reporter: bos | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.8.2 | Severity: normal
Keywords: | Testcase:
Architecture: Unknown | Os: Unknown
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`ghci` seems to treat the "`:module +`" command differently from
"`:load`", in a way that I do not understand.
If I try to load a module in the current directory, this fails:
{{{
Prelude> :m +BloomFilter
module main:BloomFilter is not loaded
Prelude> :! ls BloomFilter.hs
BloomFilter.hs
}}}
But this succeeds:
{{{
Prelude> :load BloomFilter
Ok, modules loaded: BloomFilter, BloomFilter.Mutable,
BloomFilter.Internal.
}}}
I don't have a problem with the difference in behaviour, but it doesn't
appear to be documented. I thus don't really know why it occurs (though I
can guess), which means that I can't clearly explain it as a gotcha in the
book.
Also, the the `module main:BloomFilter is not loaded` error message is
baffling: since it doesn't tell me what is actually wrong or why, I had no
idea what was occurring until I remembered the difference in behaviour
between the two commands.
Turning on "`:set -v`" doesn't shed any more light on the failure of "`:m
+`", so this is that much more difficult to figure out.
In general, the error messages from GHC and `ghci` are useful. If you
could fix this one up, that would be great! Thanks.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2371>
GHC <http://www.haskell.org/ghc/>
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