[commit: ghc] master: Point to note about FV eta-expansion performance (98a14ff)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/98a14ff0560d90eae74f42c33ee0811a15fca50f/ghc

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commit 98a14ff0560d90eae74f42c33ee0811a15fca50f
Author: Bartosz Nitka <niteria at gmail.com>
Date:   Wed Apr 20 15:31:14 2016 -0700

    Point to note about FV eta-expansion performance


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98a14ff0560d90eae74f42c33ee0811a15fca50f
 compiler/types/TyCoRep.hs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/compiler/types/TyCoRep.hs b/compiler/types/TyCoRep.hs
index 3eb431d..e1f8534 100644
--- a/compiler/types/TyCoRep.hs
+++ b/compiler/types/TyCoRep.hs
@@ -1370,6 +1370,7 @@ tyCoVarsOfTypeList ty = fvVarList $ tyCoFVsOfType ty
 -- See Note [FV naming conventions] in FV.
 --
 -- Eta-expanded because that makes it run faster (apparently)
+-- See Note [FV eta expansion] in FV for explanation.
 tyCoFVsOfType :: Type -> FV
 -- See Note [Free variables of types]
 tyCoFVsOfType (TyVarTy v)        a b c = (unitFV v `unionFV` tyCoFVsOfType (tyVarKind v)) a b c