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The class is named IsString with the single method fromString.
Overloaded strings work the same way as overloaded numeric literals.
In expressions a string literals gets a fromString applied to it.
In a pattern there will be an equality comparison with the fromString:ed literal.
Use -foverloaded-strings to enable this extension.
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This patch is a start on removing import lists and generally tidying
up the top of each module. In addition to removing import lists:
- Change DATA.IOREF -> Data.IORef etc.
- Change List -> Data.List etc.
- Remove $Id$
- Update copyrights
- Re-order imports to put non-GHC imports last
- Remove some unused and duplicate imports
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The newtype-deriving mechanism generates a HsSyn case expression looking
like this
case (d `cast` co) of { ... }
That is, the case expression scrutinises a dictionary. This is
otherwise never seen in HsSyn, and it made the desugarer
(Check.get_unused_cons) crash in tcTyConAppTyCon.
It would really be better to generate Core in TcInstDecls (the newtype
deriving part) but I'm not going to do that today. Instead, I made
Check.get_unused_cons a bit more robust.
Audrey tried to fix this over the weekend, but her fix was, alas, utterly
bogus, which caused mysterious failures later. I completely undid this
change.
Anyway it should work now!
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Wed Jul 19 09:55:27 EDT 2006 kevind@bu.edu
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Broken up massive patch -=chak
Original log message:
This is (sadly) all done in one patch to avoid Darcs bugs.
It's not complete work... more FC stuff to come. A compiler
using just this patch will fail dismally.
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MERGE TO STABLE
Fixes Trac #827
Test is should_compiler/ds058
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Most of the other users of the fptools build system have migrated to
Cabal, and with the move to darcs we can now flatten the source tree
without losing history, so here goes.
The main change is that the ghc/ subdir is gone, and most of what it
contained is now at the top level. The build system now makes no
pretense at being multi-project, it is just the GHC build system.
No doubt this will break many things, and there will be a period of
instability while we fix the dependencies. A straightforward build
should work, but I haven't yet fixed binary/source distributions.
Changes to the Building Guide will follow, too.
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