Tue Aug 22 17:33:46 PDT 2006 Manuel M T Chakravarty <[EMAIL PROTECTED]>
* Introduce coercions for data instance decls
- data instance declarations implicitly generate a coercion moving between the
representation type and family instance type.
- The coercion is *implicitly* generated when type checking both source and
ifaces. Ie, we don't safe it in ifaces - this is really exactly as newtype
coercions are handled.
- The previous addition of the instance types to DataCons has been moved to
the representation TyCon. This is more efficient as it is shared between
all
constructors of one representation tycon and it also gathers everything
about
data instances (family tycon, instance types, and coercion) in one place:
the
algTcParent field of TyCon.
- The coercion is already used in the datacon wrappers, but not yet during
type
checking pattern matching of indexed data types.
- The code has only been lightly tested, but doesn't seem to break features
not
related to indexed types. For indexed data types only the pattern matching
tc code (in TcPat.tcConPat) and some well-formedness checks are still
missing. And there will surely be some bugs to fix. (newtypes still
require
some more work.)
** WARNING: Interface file format changed! **
** Recompile from scratch! **
M ./compiler/basicTypes/DataCon.lhs -23 +7
M ./compiler/basicTypes/MkId.lhs -18 +32
M ./compiler/basicTypes/OccName.lhs -3 +24
M ./compiler/iface/BinIface.hs -4 +2
M ./compiler/iface/BuildTyCl.lhs -23 +51
M ./compiler/iface/IfaceSyn.lhs -14 +18
M ./compiler/iface/MkIface.lhs -7 +9
M ./compiler/iface/TcIface.lhs -14 +11
M ./compiler/prelude/TysWiredIn.lhs -1
M ./compiler/typecheck/TcTyClsDecls.lhs -11 +7
M ./compiler/types/Coercion.lhs -2 +26
M ./compiler/types/TyCon.lhs -9 +32
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