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Now ":load M" always searches for a module called "M", rather than
using a file called "M.hs" if that exists.  To get the file semantics
(i.e. not loading "M.o"), use ":load M.hs".

no idea why this only just showed up...

Saves space in the symbol table and speeds up linking

We want to be able to pick the RTS flavour (e.g. -threaded) when we
link the final program.

RTLD_NOW apparently causes some problems, according to previous
mailing-list discussion

 http://www.haskell.org/pipermail/cvs-ghc/2007-September/038570.html

It's now easier to add new repos anywhere in the source tree

just saves a bit of typing

rather than the first one that it finds on the PATH

Unless sparks are roots, strategies don't work at all: all the sparks
get GC'd.  We need to think about this some more.