From: Simon Peyton Jones <simonpj@microsoft.com>
Date: Wed, 20 Apr 2011 16:15:38 +0000 (+0100)
Subject: Fix Trac #5126: generate correct usage info in TH declaration quotes
X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=commitdiff_plain;h=620410fed8ee6169ccdfd5d7f914433319b29ae8

Fix Trac #5126: generate correct usage info in TH declaration quotes

In RnBinds.rnValBindsRHS I had
      (sig_dus `plusDU` bind_dus)
when it should be
      (bind_dus `plusDU` sig_dus)

So the fix is easy.
---

diff --git a/compiler/rename/RnBinds.lhs b/compiler/rename/RnBinds.lhs
index 21822a8..df3b12d 100644
--- a/compiler/rename/RnBinds.lhs
+++ b/compiler/rename/RnBinds.lhs
@@ -306,7 +306,10 @@ rnValBindsRHS trim mb_bound_names (ValBindsIn mbinds sigs)
            (anal_binds, anal_dus) -> return (valbind', valbind'_dus)
               where
                 valbind' = ValBindsOut anal_binds sigs'
-                valbind'_dus = usesOnly (hsSigsFVs sigs') `plusDU` anal_dus
+                valbind'_dus = anal_dus `plusDU` usesOnly (hsSigsFVs sigs')
+			       -- Put the sig uses *after* the bindings
+			       -- so that the binders are removed from 
+			       -- the uses in the sigs
        }
 
 rnValBindsRHS _ _ b = pprPanic "rnValBindsRHS" (ppr b)