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Its marked as broken, as this does not work yet, but we are calling it a
day here soon, so I want this to be recorded (#8959).

When printing Haskell source, and UnicodeSyntax is enabled, use the
unicode sytax characters (#8959).

All the initial work on this was done fy 'archblob' (fcsernik@gmail.com);
thank you!

I reviewed the patch, started some tidying, up and then ended up in a huge
swamp of changes, not all of which I can remember now.  But:

* To suppress kind arguments when we have -fno-print-explicit-kinds,
    - IfaceTyConApp argument types are in a tagged list IfaceTcArgs

* To allow overloaded types to be printed with =>, add IfaceDFunTy to IfaceType.

* When printing data/type family instances for the user, I've made them
  print out an informative RHS, which is a new feature. Thus
        ghci> info T
        data family T a
        data instance T Int = T1 Int Int
        data instance T Bool = T2

* In implementation terms, pprIfaceDecl has just one "context" argument,
  of type IfaceSyn.ShowSub, which says
       - How to print the binders of the decl
         see note [Printing IfaceDecl binders] in IfaceSyn
       - Which sub-comoponents (eg constructors) to print

* Moved FastStringEnv from RnEnv to OccName

It all took a ridiculously long time to do.  But it's done!

in order to get a reliable error message
(although the error message could be improved anyways to mention the
explicit package the module is imported with.)

to keep validate working.

Signed-off-by: Austin Seipp <austin@well-typed.com>

This prepares against future breakage, especially if #8894 is tackled.

See the comments in Packages.lhs and the ticket for some more explanation.

This is a temporary fix while we consider a way to re-enable intra-package
references in the mean time.
Authored-by: Reid Barton <rwbarton@gmail.com>
Signed-off-by: Austin Seipp <austin@well-typed.com>

Fixes Trac #8674

Splices are now run in the renamer instead of the type checker, so they
only get run once.

Issue #8393

Signed-off-by: Austin Seipp <austin@well-typed.com>

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

Depends on fix in 3229eadb to pass

Signed-off-by: Austin Seipp <aseipp@pobox.com>