1. 03 Nov, 2004 1 commit
  2. 01 Oct, 2004 1 commit
    • simonpj's avatar
      [project @ 2004-10-01 13:42:04 by simonpj] · 837824d2
      simonpj authored
      ------------------------------------
      	Simplify the treatment of newtypes
      	Complete hi-boot file consistency checking
      	------------------------------------
      
      In the representation of types, newtypes used to have a special constructor
      all to themselves, very like TyConApp, called NewTcApp.    The trouble is
      that means we have to *know* when a newtype is a newtype, and in an hi-boot
      context we may not -- the data type might be declared as
      	data T
      in the hi-boot file, but as
      	newtype T = ...
      in the source file.  In GHCi, which accumulates stuff from multiple compiles,
      this makes a difference.
      
      So I've nuked NewTcApp.  Newtypes are represented using TyConApps again. This
      turned out to reduce the total amount of code, and simplify the Type data type,
      which is all to the good.
      
      
      This commit also fixes a few things in the hi-boot consistency checking
      stuff.
      837824d2
  3. 30 Sep, 2004 1 commit
    • simonpj's avatar
      [project @ 2004-09-30 10:35:15 by simonpj] · 23f40f0e
      simonpj authored
      ------------------------------------
      	Add Generalised Algebraic Data Types
      	------------------------------------
      
      This rather big commit adds support for GADTs.  For example,
      
          data Term a where
       	  Lit :: Int -> Term Int
      	  App :: Term (a->b) -> Term a -> Term b
      	  If  :: Term Bool -> Term a -> Term a
      	  ..etc..
      
          eval :: Term a -> a
          eval (Lit i) = i
          eval (App a b) = eval a (eval b)
          eval (If p q r) | eval p    = eval q
          		    | otherwise = eval r
      
      
      Lots and lots of of related changes throughout the compiler to make
      this fit nicely.
      
      One important change, only loosely related to GADTs, is that skolem
      constants in the typechecker are genuinely immutable and constant, so
      we often get better error messages from the type checker.  See
      TcType.TcTyVarDetails.
      
      There's a new module types/Unify.lhs, which has purely-functional
      unification and matching for Type. This is used both in the typechecker
      (for type refinement of GADTs) and in Core Lint (also for type refinement).
      23f40f0e
  4. 19 Jul, 2004 1 commit
    • simonpj's avatar
      [project @ 2004-07-19 11:29:34 by simonpj] · c92ad297
      simonpj authored
      Template Haskell improvements
      
      a) Make '() and '[] work.
      b) Add tupleTypeName, tupleDataName
      b) Try to improve error message for (lack of) existential data constructors in TH
      c92ad297
  5. 02 Jun, 2004 1 commit
    • simonpj's avatar
      [project @ 2004-06-02 08:23:43 by simonpj] · 5568d10f
      simonpj authored
      -------------------------------
      	Fix a grevious bug in DsMeta
      	which caused a seg fault
      	-------------------------------
      
      The bug was an incorrectly declared type for one of the Template
      Haskell construction functions in DsMeta (repRecCon, repRecUpd)
      and some associated jiggery pokery.
      
      -dcore-lint showed it up nicely, because the desugarer generated
      ill-typed code.
      
      DsMeta PrelNames TH.Lib
      5568d10f
  6. 01 Jun, 2004 1 commit
    • igloo's avatar
      [project @ 2004-06-01 23:22:30 by igloo] · 5ca86c67
      igloo authored
      Add missing functions to TH export list (mostly spotted by Duncan Coutts).
      
      Update TH test output.
      
      Add TH support for patterns with type signatures, and test for same
      (requested by Isaac Jones).
      
      Add TH support for pattern guards, and tests for same
      (requested by Isaac Jones).
      
      Add infix patterns to TH datatypes.
      
      Added Lift instances for 2- to 7-tuples (requested by Duncan Coutts).
      5ca86c67
  7. 06 Apr, 2004 1 commit
  8. 05 Apr, 2004 1 commit
  9. 02 Apr, 2004 3 commits
    • simonpj's avatar
      [project @ 2004-04-02 16:51:45 by simonpj] · c244ae2a
      simonpj authored
      Wibble to last commit
      c244ae2a
    • simonpj's avatar
      [project @ 2004-04-02 16:46:57 by simonpj] · 40888e1d
      simonpj authored
      Extend the "newtype deriving" feature a little bit more
      (at the request of Wolfgang Jeltsch)
      
      Here's the example:
          class C a b
          instance C [a] Char
          newtype T = T Char deriving( C [a] )
      
      Perfectly sensible, and no reason it should not work.
      Fixing this required me to generalise the abstract syntax of
      a 'deriving' item, hence the non-local effects.
      40888e1d
    • igloo's avatar
      [project @ 2004-04-02 02:39:26 by igloo] · 427ce38d
      igloo authored
      Add support for foreign imports inside quasi-quotes.
      Gave TH a few more uniques to play with and fixed a typo.
      427ce38d
  10. 17 Mar, 2004 1 commit
    • simonpj's avatar
      [project @ 2004-03-17 13:59:06 by simonpj] · af5a2151
      simonpj authored
      ------------------------
      	More newtype clearing up
      	------------------------
      
      * Change the representation of TyCons so that it accurately reflects
      	* data     (0 or more constrs)
      	* newtype  (1 constr)
      	* abstract (unknown)
        Replaces DataConDetails and AlgTyConFlavour with AlgTyConRhs
      
      * Add IfaceSyn.IfaceConDecls, a kind of stripped-down analogue
        of AlgTyConRhs
      
      * Move NewOrData from BasicTypes to HsDecl (it's now an HsSyn thing)
      
      * Arrange that Type.newTypeRep and splitRecNewType_maybe unwrap just
        one layer of new-type-ness, leaving the caller to recurse.
      
        This still leaves typeRep and repType in Type.lhs; these functions
        are still vaguely disturbing and probably should get some attention.
      
      Lots of knock-on changes.  Fixes bug in ds054.
      af5a2151
  11. 15 Jan, 2004 1 commit
  12. 05 Jan, 2004 1 commit
  13. 04 Jan, 2004 1 commit
    • igloo's avatar
      [project @ 2004-01-04 01:48:04 by igloo] · 6da2fdc8
      igloo authored
      Split the pretty-printer out - pprint will now give you pretty much
      anything you are likely to want to pretty-print as a String. For a Doc
      you need (to_HPJ_Doc . ppr), which could be made nicer if it is widely
      used.
      
      Also took the opportunity to do a bit of module renaming and fixed the
      odd typo here and there.
      6da2fdc8
  14. 16 Dec, 2003 1 commit
    • simonpj's avatar
      [project @ 2003-12-16 16:24:55 by simonpj] · cb2be98a
      simonpj authored
      --------------------
      	Towards type splices
      	--------------------
      
      Starts the move to supporting type splices, by making
      HsExpr.HsSplice a separate type of its own, and adding
      HsSpliceTy constructor to HsType.
      cb2be98a
  15. 10 Dec, 2003 1 commit
    • simonmar's avatar
      [project @ 2003-12-10 14:15:16 by simonmar] · 55042138
      simonmar authored
      Add accurate source location annotations to HsSyn
      -------------------------------------------------
      
      Every syntactic entity in HsSyn is now annotated with a SrcSpan, which
      details the exact beginning and end points of that entity in the
      original source file.  All honest compilers should do this, and it was
      about time GHC did the right thing.
      
      The most obvious benefit is that we now have much more accurate error
      messages; when running GHC inside emacs for example, the cursor will
      jump to the exact location of an error, not just a line somewhere
      nearby.  We haven't put a huge amount of effort into making sure all
      the error messages are accurate yet, so there could be some tweaking
      still needed, although the majority of messages I've seen have been
      spot-on.
      
      Error messages now contain a column number in addition to the line
      number, eg.
      
         read001.hs:25:10: Variable not in scope: `+#'
      
      To get the full text span info, use the new option -ferror-spans.  eg.
      
         read001.hs:25:10-11: Variable not in scope: `+#'
      
      I'm not sure whether we should do this by default.  Emacs won't
      understand the new error format, for one thing.
      
      In a more elaborate editor setting (eg. Visual Studio), we can arrange
      to actually highlight the subexpression containing an error.  Eventually
      this information will be used so we can find elements in the abstract
      syntax corresponding to text locations, for performing high-level editor
      functions (eg. "tell me the type of this expression I just highlighted").
      
      Performance of the compiler doesn't seem to be adversely affected.
      Parsing is still quicker than in 6.0.1, for example.
      
      Implementation:
      
      This was an excrutiatingly painful change to make: both Simon P.J. and
      myself have been working on it for the last three weeks or so.  The
      basic changes are:
      
       - a new datatype SrcSpan, which represents a beginning and end position
         in a source file.
      
       - To reduce the pain as much as possible, we also defined:
      
            data Located e = L SrcSpan e
      
       - Every datatype in HsSyn has an equivalent Located version.  eg.
      
            type LHsExpr id = Located (HsExpr id)
      
         and pretty much everywhere we used to use HsExpr we now use
         LHsExpr.  Believe me, we thought about this long and hard, and
         all the other options were worse :-)
      
      
      Additional changes/cleanups we made at the same time:
      
        - The abstract syntax for bindings is now less arcane.  MonoBinds
          and HsBinds with their built-in list constructors have gone away,
          replaced by HsBindGroup and HsBind (see HsSyn/HsBinds.lhs).
      
        - The various HsSyn type synonyms have now gone away (eg. RdrNameHsExpr,
          RenamedHsExpr, and TypecheckedHsExpr are now HsExpr RdrName,
          HsExpr Name, and HsExpr Id respectively).
      
        - Utilities over HsSyn are now collected in a new module HsUtils.
          More stuff still needs to be moved in here.
      
        - MachChar now has a real Char instead of an Int.  All GHC versions that
          can compile GHC now support 32-bit Chars, so this was a simplification.
      55042138
  16. 06 Nov, 2003 1 commit
    • simonpj's avatar
      [project @ 2003-11-06 17:09:50 by simonpj] · 1f5e5580
      simonpj authored
      ------------------------------------
      	Major increment for Template Haskell
      	------------------------------------
      
      1.  New abstract data type "Name" which appears where String used to be.
          E.g. 	data Exp = VarE Name | ...
      
      2.  New syntax 'x and ''T, for quoting Names.  It's rather like [| x |]
          and [t| T |] respectively, except that
      
      	a) it's non-monadic:  'x :: Name
      	b) you get a Name not an Exp or Type
      
      3.  reify is an ordinary function
      	reify :: Name -> Q Info
          New data type Info which tells what TH knows about Name
      
      4.  Local variables work properly.  So this works now (crashed before):
      	f x = $( [| x |] )
      
      5.  THSyntax is split up into three modules:
      
        Language.Haskell.TH		TH "clients" import this
      
        Language.Haskell.TH.THSyntax	data type declarations and internal stuff
      
        Language.Haskell.TH.THLib	Support library code (all re-exported
      				by TH), including smart constructors and
      				pretty printer
      
      6.  Error reporting and recovery are in (not yet well tested)
      
      	report :: Bool {- True <=> fatal -} -> String -> Q ()
      	recover :: Q a -> Q a -> Q a
      
      7.  Can find current module
      
      	currentModule :: Q String
      
      
      Much other cleaning up, needless to say.
      1f5e5580
  17. 04 Nov, 2003 1 commit
  18. 30 Oct, 2003 2 commits
    • simonpj's avatar
      [project @ 2003-10-30 10:14:59 by simonpj] · fc6b0049
      simonpj authored
      1.  When desugaring a [d| ... |], do not gensym the method names of
          an instance declaration, else we get very confused!
      
      2.  We don't need to make fresh Names in DsMeta.mkGenSym, because
          the existing Name will do, I believe.  We'll do the genSym when
          we *run* the splice.  (This stuff makes my head hurt.)
      
          Assuming this is so, we can simplify the mkGenSym stuff still more.
      fc6b0049
    • simonpj's avatar
      [project @ 2003-10-30 09:33:30 by simonpj] · 5a0fa261
      simonpj authored
      Updating TH; not finished
      5a0fa261
  19. 23 Oct, 2003 1 commit
  20. 09 Oct, 2003 1 commit
    • simonpj's avatar
      [project @ 2003-10-09 11:58:39 by simonpj] · 98688c6e
      simonpj authored
      -------------------------
      		GHC heart/lung transplant
      		-------------------------
      
      This major commit changes the way that GHC deals with importing
      types and functions defined in other modules, during renaming and
      typechecking.  On the way I've changed or cleaned up numerous other
      things, including many that I probably fail to mention here.
      
      Major benefit: GHC should suck in many fewer interface files when
      compiling (esp with -O).  (You can see this with -ddump-rn-stats.)
      
      It's also some 1500 lines of code shorter than before.
      
      **	So expect bugs!  I can do a 3-stage bootstrap, and run
      **	the test suite, but you may be doing stuff I havn't tested.
      ** 	Don't update if you are relying on a working HEAD.
      
      
      In particular, (a) External Core and (b) GHCi are very little tested.
      
      	But please, please DO test this version!
      
      
      	------------------------
      		Big things
      	------------------------
      
      Interface files, version control, and importing declarations
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      * There is a totally new data type for stuff that lives in interface files:
      	Original names			IfaceType.IfaceExtName
      	Types				IfaceType.IfaceType
      	Declarations (type,class,id)	IfaceSyn.IfaceDecl
      	Unfoldings			IfaceSyn.IfaceExpr
        (Previously we used HsSyn for type/class decls, and UfExpr for unfoldings.)
        The new data types are in iface/IfaceType and iface/IfaceSyn.  They are
        all instances of Binary, so they can be written into interface files.
        Previous engronkulation concering the binary instance of RdrName has
        gone away -- RdrName is not an instance of Binary any more.  Nor does
        Binary.lhs need to know about the ``current module'' which it used to,
        which made it specialised to GHC.
      
        A good feature of this is that the type checker for source code doesn't
        need to worry about the possibility that we might be typechecking interface
        file stuff.  Nor does it need to do renaming; we can typecheck direct from
        IfaceSyn, saving a whole pass (module TcIface)
      
      * Stuff from interface files is sucked in *lazily*, rather than being eagerly
        sucked in by the renamer. Instead, we use unsafeInterleaveIO to capture
        a thunk for the unfolding of an imported function (say).  If that unfolding
        is every pulled on, TcIface will scramble over the unfolding, which may
        in turn pull in the interface files of things mentioned in the unfolding.
      
        The External Package State is held in a mutable variable so that it
        can be side-effected by this lazy-sucking-in process (which may happen
        way later, e.g. when the simplifier runs).   In effect, the EPS is a kind
        of lazy memo table, filled in as we suck things in.  Or you could think
        of it as a global symbol table, populated on demand.
      
      * This lazy sucking is very cool, but it can lead to truly awful bugs. The
        intent is that updates to the symbol table happen atomically, but very bad
        things happen if you read the variable for the table, and then force a
        thunk which updates the table.  Updates can get lost that way. I regret
        this subtlety.
      
        One example of the way it showed up is that the top level of TidyPgm
        (which updates the global name cache) to be much more disciplined about
        those updates, since TidyPgm may itself force thunks which allocate new
        names.
      
      * Version numbering in interface files has changed completely, fixing
        one major bug with ghc --make.  Previously, the version of A.f changed
        only if A.f's type and unfolding was textually different.  That missed
        changes to things that A.f's unfolding mentions; which was fixed by
        eagerly sucking in all of those things, and listing them in the module's
        usage list.  But that didn't work with --make, because they might have
        been already sucked in.
      
        Now, A.f's version changes if anything reachable from A.f (via interface
        files) changes.  A module with unchanged source code needs recompiling
        only if the versions of any of its free variables changes. [This isn't
        quite right for dictionary functions and rules, which aren't mentioned
        explicitly in the source.  There are extensive comments in module MkIface,
        where all version-handling stuff is done.]
      
      * We don't need equality on HsDecls any more (because they aren't used in
        interface files).  Instead we have a specialised equality for IfaceSyn
        (eqIfDecl etc), which uses IfaceEq instead of Bool as its result type.
        See notes in IfaceSyn.
      
      * The horrid bit of the renamer that tried to predict what instance decls
        would be needed has gone entirely.  Instead, the type checker simply
        sucks in whatever instance decls it needs, when it needs them.  Easy!
      
        Similarly, no need for 'implicitModuleFVs' and 'implicitTemplateHaskellFVs'
        etc.  Hooray!
      
      
      Types and type checking
      ~~~~~~~~~~~~~~~~~~~~~~~
      * Kind-checking of types is far far tidier (new module TcHsTypes replaces
        the badly-named TcMonoType).  Strangely, this was one of my
        original goals, because the kind check for types is the Right Place to
        do type splicing, but it just didn't fit there before.
      
      * There's a new representation for newtypes in TypeRep.lhs.  Previously
        they were represented using "SourceTypes" which was a funny compromise.
        Now they have their own constructor in the Type datatype.  SourceType
        has turned back into PredType, which is what it used to be.
      
      * Instance decl overlap checking done lazily.  Consider
      	instance C Int b
      	instance C a Int
        These were rejected before as overlapping, because when seeking
        (C Int Int) one couldn't tell which to use.  But there's no problem when
        seeking (C Bool Int); it can only be the second.
      
        So instead of checking for overlap when adding a new instance declaration,
        we check for overlap when looking up an Inst.  If we find more than one
        matching instance, we see if any of the candidates dominates the others
        (in the sense of being a substitution instance of all the others);
        and only if not do we report an error.
      
      
      
      	------------------------
      	     Medium things
      	------------------------
      
      * The TcRn monad is generalised a bit further.  It's now based on utils/IOEnv.lhs,
        the IO monad with an environment.  The desugarer uses the monad too,
        so that anything it needs can get faulted in nicely.
      
      * Reduce the number of wired-in things; in particular Word and Integer
        are no longer wired in.  The latter required HsLit.HsInteger to get a
        Type argument.  The 'derivable type classes' data types (:+:, :*: etc)
        are not wired in any more either (see stuff about derivable type classes
        below).
      
      * The PersistentComilerState is now held in a mutable variable
        in the HscEnv.  Previously (a) it was passed to and then returned by
        many top-level functions, which was painful; (b) it was invariably
        accompanied by the HscEnv.  This change tidies up top-level plumbing
        without changing anything important.
      
      * Derivable type classes are treated much more like 'deriving' clauses.
        Previously, the Ids for the to/from functions lived inside the TyCon,
        but now the TyCon simply records their existence (with a simple boolean).
        Anyone who wants to use them must look them up in the environment.
      
        This in turn makes it easy to generate the to/from functions (done
        in types/Generics) using HsSyn (like TcGenDeriv for ordinary derivings)
        instead of CoreSyn, which in turn means that (a) we don't have to figure
        out all the type arguments etc; and (b) it'll be type-checked for us.
        Generally, the task of generating the code has become easier, which is
        good for Manuel, who wants to make it more sophisticated.
      
      * A Name now says what its "parent" is. For example, the parent of a data
        constructor is its type constructor; the parent of a class op is its
        class.  This relationship corresponds exactly to the Avail data type;
        there may be other places we can exploit it.  (I made the change so that
        version comparison in interface files would be a bit easier; but in
        fact it tided up other things here and there (see calls to
        Name.nameParent).  For example, the declaration pool, of declararations
        read from interface files, but not yet used, is now keyed only by the 'main'
        name of the declaration, not the subordinate names.
      
      * New types OccEnv and OccSet, with the usual operations.
        OccNames can be efficiently compared, because they have uniques, thanks
        to the hashing implementation of FastStrings.
      
      * The GlobalRdrEnv is now keyed by OccName rather than RdrName.  Not only
        does this halve the size of the env (because we don't need both qualified
        and unqualified versions in the env), but it's also more efficient because
        we can use a UniqFM instead of a FiniteMap.
      
        Consequential changes to Provenance, which has moved to RdrName.
      
      * External Core remains a bit of a hack, as it was before, done with a mixture
        of HsDecls (so that recursiveness and argument variance is still inferred),
        and IfaceExprs (for value declarations).  It's not thoroughly tested.
      
      
      	------------------------
      	     Minor things
      	------------------------
      
      * DataCon fields dcWorkId, dcWrapId combined into a single field
        dcIds, that is explicit about whether the data con is a newtype or not.
        MkId.mkDataConWorkId and mkDataConWrapId are similarly combined into
        MkId.mkDataConIds
      
      * Choosing the boxing strategy is done for *source* type decls only, and
        hence is now in TcTyDecls, not DataCon.
      
      * WiredIn names are distinguished by their n_sort field, not by their location,
        which was rather strange
      
      * Define Maybes.mapCatMaybes :: (a -> Maybe b) -> [a] -> [b]
        and use it here and there
      
      * Much better pretty-printing of interface files (--show-iface)
      
      Many, many other small things.
      
      
      	------------------------
      	     File changes
      	------------------------
      * New iface/ subdirectory
      * Much of RnEnv has moved to iface/IfaceEnv
      * MkIface and BinIface have moved from main/ to iface/
      * types/Variance has been absorbed into typecheck/TcTyDecls
      * RnHiFiles and RnIfaces have vanished entirely.  Their
        work is done by iface/LoadIface
      * hsSyn/HsCore has gone, replaced by iface/IfaceSyn
      * typecheck/TcIfaceSig has gone, replaced by iface/TcIface
      * typecheck/TcMonoType has been renamed to typecheck/TcHsType
      * basicTypes/Var.hi-boot and basicTypes/Generics.hi-boot have gone altogether
      98688c6e
  21. 24 Sep, 2003 1 commit
  22. 23 Sep, 2003 1 commit
    • simonmar's avatar
      [project @ 2003-09-23 14:32:57 by simonmar] · abbc5a0b
      simonmar authored
      - Convert many of the optimisation options into dynamic options (that is,
        they can be mentioned in {-# OPTIONS #-} pragmas).
      
      - Add a new way to specify constructor-field unboxing on a selective
        basis.  To tell the compiler to unbox a constructor field, do this:
      
            data T = T !!Int
      
        and GHC will store that field unboxed if possible.  If it isn't possible
        (say, because the field has a sum type) then the annotation is ignored.
      
        The -funbox-strict-fields flag is now a dynamic flag, and has the same
        effect as replacing all the '!' annotations with '!!'.
      abbc5a0b
  23. 16 Sep, 2003 1 commit
    • simonmar's avatar
      [project @ 2003-09-16 13:03:37 by simonmar] · 2129fa6f
      simonmar authored
      Legacy Removal
      ~~~~~~~~~~~~~~
      
      The following features have been consigned to the bit bucket:
      
        _ccall_
        _casm_
        ``....''  (lit-lits)
        the CCallable class
        the CReturnable class
      2129fa6f
  24. 08 Jun, 2003 1 commit
  25. 06 Jun, 2003 1 commit
  26. 21 May, 2003 3 commits
    • igloo's avatar
      [project @ 2003-05-21 23:40:08 by igloo] · 4b80c3db
      igloo authored
      Rename and reorder the internals for unique ids etc. Also fixed a couple
      of THSyntax names.
      4b80c3db
    • igloo's avatar
      [project @ 2003-05-21 18:07:13 by igloo] · 9b5fb22b
      igloo authored
      The Great Renaming. I hope I've kept everything in sync - and all the tests
      pass. Now datatypes follow the
      
      data Foo = <a kind of Foo>Foo
               | <another kind of Foo>Foo
      
      convention and the smart constructors can be uniformly created by
      lowercasing the first letter of the constructor.
      9b5fb22b
    • igloo's avatar
      [project @ 2003-05-21 02:58:39 by igloo] · a011a71c
      igloo authored
      Added support for newtypes to TH and altered a test for them.
      a011a71c
  27. 04 May, 2003 1 commit
  28. 22 Apr, 2003 1 commit
    • igloo's avatar
      [project @ 2003-04-22 20:39:59 by igloo] · c21fbf92
      igloo authored
      Order declarations in reifications in order of source line number.
      The bugs still there but it bites less often now...
      
      Also remove the type parameterisation and do some type renaming as
      discussed on the template-haskell list.
      c21fbf92
  29. 10 Apr, 2003 1 commit
  30. 16 Mar, 2003 1 commit
  31. 21 Feb, 2003 1 commit
  32. 20 Feb, 2003 1 commit
    • simonpj's avatar
      [project @ 2003-02-20 18:33:50 by simonpj] · 56b5a8b8
      simonpj authored
      -------------------------------------
            Add Core Notes and the {-# CORE #-} pragma
      	-------------------------------------
      
      This is an idea of Hal Daume's. The key point is that Notes in Core
      are augmented thus:
      
        data Note
          = SCC CostCentre
          | ...
          | CoreNote String     -- NEW
      
      These notes can be injected via a Haskell-source pragma:
      
         f x = ({-# CORE "foo" #-} show) ({-# CORE "bar" #-} x)
      
      This wraps a (Note (CoreNote "foo")) around the 'show' variable,
      and a similar note around the argument to 'show'.
      
      These notes are basically ignored by GHC, but are emitted into
      External Core, where they may convey useful information.
      
      Exactly how code involving these notes is munged by the simplifier
      isn't very well defined.  We'll see how it pans out.  Meanwhile
      the impact on the rest of the compiler is minimal.
      56b5a8b8
  33. 18 Feb, 2003 1 commit
    • igloo's avatar
      [project @ 2003-02-18 16:23:35 by igloo] · cdb01ba2
      igloo authored
      Support strictness annotations on data declarations and support the record
      and infix constructors. Also tweaked the pretty printer a bit.
      cdb01ba2
  34. 12 Feb, 2003 1 commit
    • simonpj's avatar
      [project @ 2003-02-12 15:01:31 by simonpj] · 42b63073
      simonpj authored
      -------------------------------------
        Big upheaval to the way that constructors are named
      	-------------------------------------
      
      This commit enshrines the new story for constructor names.  We could never
      really get External Core to work nicely before, but now it does.
      
      The story is laid out in detail in the Commentary
      	ghc/docs/comm/the-beast/data-types.html
      so I will not repeat it here.
      
      	[Manuel: the commentary isn't being updated, apparently.]
      
      However, the net effect is that in Core and in External Core, contructors look
      like constructors, and the way things are printed is all consistent.
      
      It is a fairly pervasive change (which is why it has been so long postponed),
      but I hope the question is now finally closed.
      
      All the libraries compile etc, and I've run many tests, but doubtless there will
      be some dark corners.
      42b63073
  35. 06 Feb, 2003 1 commit
    • simonpj's avatar
      [project @ 2003-02-06 17:15:50 by simonpj] · 70e9ee75
      simonpj authored
      -------------------------------------
        Fix parsing of floating-point constants in External Core
      	-------------------------------------
      
      This fix accidentally made it into the previous (unrelated) commit,
      so it's really the *previous* change to LexCore you should look
      at.
      
      The fix updates LexCore so that it can parse literals in scientific
      notation (e.g. 4.3e-3)
      70e9ee75