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An 80% solution to generating derived instances. A complete solution
would duplicate the instance inference logic, but if a type variable
occurs as a constructor argument, then we can just propagate the derived
class to the variable. But we know nothing of the constraints on any
type variables that occur elsewhere. For example, the declarations
data Either a b = Left a | Right b deriving (Eq, Ord)
data Ptr a = Ptr Addr# deriving (Eq, Ord)
newtype IORef a = IORef (STRef RealWorld a) deriving Eq
yield the instances
(Eq a, Eq b) => Eq (Either a b)
(Ord a, Ord b) => Ord (Either a b)
Eq (Ptr a)
Ord (Ptr a)
(??? a) => Eq (IORef a)
The last example shows the limits of this local analysis.
Note that a type variable may be in both categories: then we know a
constraint, but there may be more, or a stronger constraint, e.g.
data Tree a = Node a [Tree a] deriving Eq
yields
(Eq a, ??? a) => Eq (Tree a)
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Patch to allow simple hyperlinking to an arbitrary location in another
module's documentation, from Volker Stolz.
Now in a doc comment:
#foo#
creates
<a name="foo"></a>
And you can use the form "M\#foo" to hyperlink to the label 'foo' in
module 'M'. Note that the backslash is necessary for now.
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Patches to quieten ghc -Wall, from those nice folks at Galois.
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Allow exporting of individual class methods and record selectors. For
these we have to invent the correct type signature, which we do in the
simplest possible way (i.e. no context reduction nonsense in the class
case).
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Rename the module documentation properly (bug reported by Sven Panne).
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Fix bug: we weren't renaming HsDocCommentNamed in renameDecl
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Lots of changes:
- instances of a class are listed with the class, and
instances involving a datatype are listed with that type.
Derived instances aren't included at the moment: the calculation
to find the instance head for a derived instance is non-trivial.
- some formatting changes; use rows with specified height rather than
cellspacing in some places.
- various fixes (source file links were wrong, amongst others)
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Reworking of the internals to support documenting function arguments
(the Most Wanted new feature by the punters).
The old method of keeping parsed documentation in a Name -> Doc
mapping wasn't going to cut it for anntations on type components,
where there's no name to attach the documentation to, so I've moved to
storing all the documentation in the abstract syntax. Previously some
of the documentation was left in the abstract syntax by the parser,
but was later extracted into the mapping.
In order to avoid having to parameterise the abstract syntax over the
type of documentation stored in it, we have to parse the documentation
at the same time as we parse the Haskell source (well, I suppose we
could store 'Either String Doc' in the HsSyn, but that's clunky). One
upshot is that documentation is now parsed eagerly, and documentation
parse errors are fatal (but have better line numbers in the error
message).
The new story simplifies matters for the code that processes the
source modules, because we don't have to maintain the extra Name->Doc
mapping, and it should improve efficiency a little too.
New features:
- Function arguments and return values can now have doc annotations.
- If you refer to a qualified name in a doc string, eg. 'IO.putStr',
then Haddock will emit a hyperlink even if the identifier is not
in scope, so you don't have to make sure everything referred to
from the documentation is imported.
- several bugs & minor infelicities fixed.
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Add support for existential quantifiers on constructors.
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Add a facility for specifying options that affect Haddock's treatment
of the module. Options are given at the top of the module in a
comma-separated list, beginning with '-- #'. eg.
-- # prune, hide, ignore-exports
Options currently available, with their meanings:
prune:
ignore declarations which have no documentation annotations
ignore-exports:
act as if the export list were not specified (i.e. export
everything local to the module).
hide:
do not include this module in the generated documentation, but
propagate any exported definitions to modules which re-export
them.
There's a slight change in the semantics for re-exporting a full
module by giving 'module M' in the export list: if module M does not
have the 'hide' option, then the documentation will now just contain a
reference to module M rather than the full inlined contents of that
module.
These features, and some other changes in the pipeline, are the result
of discussions between myself and Manuel Chakravarty
<chak@cse.unsw.edu.au> (author of IDoc) yesterday.
Also: some cleanups, use a Writer monad to collect error messages in
some places instead of just printing them with trace.
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- support for fundeps (partially contributed by Brett Letner - thanks
Brett).
- make it build with GHC 4.08.2
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- Add support for named chunks of documentation which can be
referenced from the export list.
- Copy the icon from $libdir to the destination in HTML mode.
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Generate a little table of contents at the top of the module doc (only
if the module actually contains some section headings, though).
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Lots of changes, including:
- add index support to the HTML backend
- clean up the renamer, put it into a monad
- propogate unresolved names to the top level and report them in a nicer way
- various bugfixes
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