[commit: ghc] master: Fix comments on isValArg (24644bb)

[Simon Peyton Jones]

Repository : ssh://darcs.haskell.org//srv/darcs/ghc

On branch  : master

http://hackage.haskell.org/trac/ghc/changeset/24644bb756950b486f988e0b2d5d55b79d8e1490

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

commit 24644bb756950b486f988e0b2d5d55b79d8e1490
Author: Simon Peyton Jones <simonpj at microsoft.com>
Date:   Mon Jan 28 18:21:04 2013 +0000

    Fix comments on isValArg

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

 compiler/coreSyn/CoreSyn.lhs |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/compiler/coreSyn/CoreSyn.lhs b/compiler/coreSyn/CoreSyn.lhs
index 685975f..6423c7e 100644
--- a/compiler/coreSyn/CoreSyn.lhs
+++ b/compiler/coreSyn/CoreSyn.lhs
@@ -1324,8 +1324,9 @@ isRuntimeVar = isId
 isRuntimeArg :: CoreExpr -> Bool
 isRuntimeArg = isValArg
 
--- | Returns @False@ iff the expression is a 'Type' or 'Coercion'
--- expression at its top level
+-- | Returns @True@ for value arguments, false for type args
+-- NB: coercions are value arguments (zero width, to be sure,
+-- like State#, but still value args).
 isValArg :: Expr b -> Bool
 isValArg e = not (isTypeArg e)