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But only when the module exports refer to different modules.
See ticket #4478.

I suspect this is a vary rarely used extension to the official layout
rule.

I really don't know how this module got left out of my last
patch, namely
  Thu Dec  2 12:35:47 GMT 2010  simonpj@microsoft.com
  * Re-jig simplifySuperClass (again)

I suggest you don't pull either the patch above, or this
one, unless you really have to.  I'm not fully confident
that it works properly yet.  Ran out of time. Sigh.

If a throwTo targets a thread that has just been created with
forkOnIO, then it is possible the exception strikes while the thread
is still in the process of migrating.  throwTo() didn't handle this
case, but it's fairly straightforward.

And remove the old mechanism of recording dfun uses separately,
because it didn't work.

This wiki page describes recompilation avoidance and fingerprinting.
I'll update it to describe the new method and what went wrong with the
old method:

http://hackage.haskell.org/trac/ghc/wiki/Commentary/Compiler/RecompilationAvoidance

This fixes the current loop in T3731, and will fix other
reported loops.  The loops show up when we are generating
evidence for superclasses in an instance declaration.

The trick is to make the "self" dictionary simplifySuperClass
depend *explicitly* on the superclass we are currently trying
to build.  See Note [Dependencies in self dictionaries] in TcSimplify.

That in turn means that EvDFunApp needs a dependency-list, used
when chasing dependencies in isGoodRecEv.

See Note [Rebindable syntax for if].  Fixes Trac #4798.
Thanks to Nils Schweinsberg <mail@n-sch.de>

See Note [Matching lets], which explains it all in detail.
It took me a day to think of a nice way to fix the bug,
but I think the result is quite respectable. Subtle, though.

Don't use mmap on powerpc-apple-darwin as mmap doesn't support
reallocating but we need to allocate jump islands just after each
object images. Otherwise relative branches to jump islands can fail
due to 24-bits displacement overflow.

This routine should be aware of Mach-O misalignment of malloc'ed memory regions.

Use fseek(3) instead of rewind(3) to move the file position indicator back to the initial position. Otherwise we can't use this function in loadArchive().

I found this function causes a segfault when ocAllocateSymbolExtras() has allocated a separate memory region for jump islands.

The extension was rejected by Haskell', and deprecated in 7.0.

GHCi libs are no longer necessary, as we can use the .a or .so versions
instead.

If the GHCi .o lib doesn't exist, load the .a instead

This makes sure that join points are fully specialised in loops which are
marked as ForceSpecConstr.

Now, -ddump-rule-firings only shows the names of the rules that fired (it would
show "before" and "after" with -dverbose-core2core previously) and
-ddump-rule-rewrites always shows the "before" and "after" bits, even without
-dverbose-core2core.

This patch removes the Lint test, and comments why

See Note [WildCard binders] in SimplEnv.  Spotted by Roman.