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Release~0.10 was the first major, public release of this compilation
system.
The announcement (now distributed in \tr{ghc/docs/ANNOUNCE-0.10})
describes the most notable features of this release. These notes,
therefore, just cover some of the fine points...
%************************************************************************
%* *
\subsection[0-10-new-docs]{New documentation}
%* *
%************************************************************************
We're providing a few more papers, in \tr{ghc/docs/papers}. See
\tr{ghc/docs/README} for a full list of documentation.
%************************************************************************
%* *
\subsection[0-10-new-in-usage]{User-visible changes}
%* *
%************************************************************************
An ``Appel-style'' generational garbage collector is now the default.
(It used to be a two-space copying collector.)
The flag to use the unboxery and other Glasgow extensions was
\tr{-funboxed}. We've changed it to \tr{-fglasgow-exts}. We may
elaborate this further, eventually...
(If 0.06 is the last version you looked at, flags/options have changed
a fair bit since then.)
%************************************************************************
%* *
\subsection[0-10-new-in-compiler]{New in the compiler proper}
%* *
%************************************************************************
Derived instances are in, well partly. We'll put in the rest when
there's a demand (or we have nothing better to do).
@Integers@ (arbitrary-precision integers) are now in properly.
Just as HBC does, we use the GNU multi-precision arithmetic package.
Source is in \tr{ghc/runtime/gmp}.
We did a bunch of stuff in the typechecker region to support
overloading better; we called it ``dictionary stomping.'' One
side-effect of this work is that error messages related to overloading
have a slight chance of being sensible (which they weren't before).
``Primitive arrays,'' on top of which efficient, regular Haskell
arrays can be (are) built, went in. There's a {\em little} about
using them, in the ``Glasgow extensions'' section of the User's Guide.
Similarly, the mechanisms for calling C directly (@ccall@ and @casm@)
are more likely to be useful. Again, a little documentation in the
same place...
%************************************************************************
%* *
\subsection[0-10-new-in-libraries]{In the prelude and runtime support}
%* *
%************************************************************************
Our standard prelude conforms to the Haskell~1.2 report.
We support a non-standard @fromInt@ method for the @Num@ class, just as
HBC does.
We support a non-standard @cmp3@ method for the @Ord@ class. Snoop
around in the \tr{ghc/lib/prelude/*.hs} code, if you care. (We use it
in code generated for derived instances.)
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