Re: [GHC] #2428: bad error message for multiple modules in the same file
#2428: bad error message for multiple modules in the same file
---+
Reporter: Isaac Dupree | Owner:
Type: bug | Status: closed
Priority: low | Milestone: 6.14.1
Component: Compiler |Version: 6.8.2
Resolution: wontfix | Keywords:
Difficulty: Unknown | Os: Unknown/Multiple
Testcase:| Architecture: Unknown/Multiple
Failure: None/Unknown |
---+
Changes (by igloo):
* status: new = closed
* failure: = None/Unknown
* resolution: = wontfix
Comment:
It's tricky to fix the
{{{
Could not find module `MyMod':
}}}
error, as GHC is deliberately not parsing the entire module for efficiency
reasons.
As this ticket hasn't gathered any other supporters in 2 years, I think
I'll just mark it wontfix.
--
Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/2428#comment:7
GHC http://www.haskell.org/ghc/
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Re: [GHC] #2428: bad error message for multiple modules in the same file
#2428: bad error message for multiple modules in the same file -+-- Reporter: Isaac Dupree |Owner: Type: bug | Status: new Priority: normal|Milestone: 6.12 branch Component: Compiler | Version: 6.8.2 Severity: normal| Resolution: Keywords:| Difficulty: Unknown Testcase:| Os: Unknown/Multiple Architecture: Unknown/Multiple | -+-- Changes (by igloo): * milestone: 6.10 branch = 6.12 branch -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/2428#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler___ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
[GHC] #2428: bad error message for multiple modules in the same file
#2428: bad error message for multiple modules in the same file
-+--
Reporter: Isaac Dupree | Owner:
Type: bug | Status: new
Priority: normal| Component: Compiler
Version: 6.8.2 |Severity: normal
Keywords:|Testcase:
Architecture: Unknown | Os: Unknown
-+--
consider this file:
{{{
module MyMod where
foo :: Int
foo = 3
module Main (main) where
import MyMod (foo)
main :: IO ()
main = print foo
}}}
The layout rule dictates that this parses properly (the first module
clause ends when the second module gives a parse error, just like in
ends a let); this gets the same error:
{{{
module MyMod where
{ foo :: Int; foo = 3 }
module Main (main) where
{ import MyMod (foo); main :: IO (); main = print foo }
}}}
The Haskell98 report doesn't say anything about how modules are expected
to be laid out in files, so I had assumed it would work. The error is
{{{
parse error on input `module'
}}}
(except if Main comes before `MyMod`, ''and'' --make is used with ghc, we
get
{{{
Could not find module `MyMod':
Use -v to see a list of the files searched for.
}}}
even though `MyMod` is clearly (to a human) in that very file.)
It took me a long time to figure out what was wrong and what I had to do.
Admittedly I'm only slightly interested in GHC implementing support to
allow this, since if multiple files are involved at all it causes module-
finding trouble (obviously to me now); mostly I just want a good error
message, maybe something like Each file must contain exactly one module.
Any module intended to be imported must be in an appropriately named file,
e.g. module `Module.Name' goes in `Module/Name.hs'.
( This happened to me a long time ago... but I was reminded by #2427 )
--
Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/2428
GHC http://www.haskell.org/ghc/
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