On Dec 31, 2007 11:57 AM, Neil Mitchell <[EMAIL PROTECTED]> wrote:
>
> These imports of Err all include {-# SOURCE #-} pragmas, which GHC
> warns me are unnecessary, but clear change the output. What do the
> SOURCE pragma's do? I couldn't find them in the manual.
>
They break the circular dependency between recursive modules; every
module imported with {-# SOURCE #-} must have a related .hs-boot file.
The manual describes this in section 5.6.9:
http://www.haskell.org/ghc/docs/latest/html/users_guide/separate-compilation.html#mutual-recursion
Hope that helps,
-Judah
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