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-- | Like the function 'error', but appends a stack trace to the error
-- message if one is available.
errorWithStackTrace :: String -> a

The previous implementation was:

    forever a = a >> forever a

which can create a space leak in some cases, even with optimizations.
The current implementation:

    forever a = let a' = a >> a' in a'

prevents repeated thunk allocations by creating a single thunk for the
final result, even without optimizations.

This allows the programmer to profile only part of a program's runtime,
for example, ignoring startup and shutdown phases of programs.

It can't be any other calling convention, e.g. stdcall.

Move rules in GHC.Base to PrelRules and convert them to BuiltinRules.

Nicolas Trangez authored Jul 11, 2012 and Simon Marlow committed Jul 13, 2012

See: #7067
See: http://hackage.haskell.org/trac/ghc/ticket/7067
See: http://www.haskell.org/pipermail/glasgow-haskell-users/2012-July/022579.html

joeyadams authored Jul 07, 2012 and Simon Marlow committed Jul 10, 2012

Also, add a warning to modifySTRef, mostly copy-pasted from the warning
for modifyIORef.

As per discussion on the libraries list.

Ensure numberToRangedRational returns Nothing immediately if the
exponent is outside Int range, so that we avoid an integer overflow
later.

Patch by Johan Tibell <johan.tibell@gmail.com>