[commit: base] master: Tweak alloca docs (83f2740)

[Ian Lynagh]

Repository : ssh://darcs.haskell.org//srv/darcs/packages/base

On branch  : master

http://hackage.haskell.org/trac/ghc/changeset/83f2740e7b4132594dbe5b0ab458fbdf3f197ffb

>---------------------------------------------------------------

commit 83f2740e7b4132594dbe5b0ab458fbdf3f197ffb
Author: Ian Lynagh <igloo at earth.li>
Date:   Sun Apr 3 16:27:56 2011 +0100

    Tweak alloca docs
    
    Based on a patch from Jason Dagit

>---------------------------------------------------------------

 Foreign/Marshal/Alloc.hs |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/Foreign/Marshal/Alloc.hs b/Foreign/Marshal/Alloc.hs
index ddb4a90..612d2c7 100644
--- a/Foreign/Marshal/Alloc.hs
+++ b/Foreign/Marshal/Alloc.hs
@@ -22,8 +22,9 @@
 -- foreign functions or to provide space in which compound result values
 -- are obtained from foreign functions.
 -- 
--- If any of the allocation functions fails, a value of 'nullPtr' is
--- produced.  If 'free' or 'reallocBytes' is applied to a memory area
+-- If any of the allocation functions fails, an exception is thrown.
+-- In some cases, memory exhaustion may mean the process is terminated.
+-- If 'free' or 'reallocBytes' is applied to a memory area
 -- that has been allocated with 'alloca' or 'allocaBytes', the
 -- behaviour is undefined.  Any further access to memory areas allocated with
 -- 'alloca' or 'allocaBytes', after the computation that was passed to