Don't discard usage info from coercion bindings!

diff --git a/compiler/simplCore/OccurAnal.lhs b/compiler/simplCore/OccurAnal.lhs
index c593e81..ba7d192 100644 (file)
--- a/compiler/simplCore/OccurAnal.lhs
+++ b/compiler/simplCore/OccurAnal.lhs
@@ -101,11 +101,6 @@ occAnalBind env _ (NonRec binder rhs) body_usage
   | isTyVar binder     -- A type let; we don't gather usage info
   = (body_usage, [NonRec binder rhs])
 
-  | isCoVar binder      -- A coercion let; again no usage info
-                        -- We trust that it'll get inlined away
-                        -- as soon as it takes form (cv = Coercion co)
-  = (body_usage, [NonRec binder rhs])
-
   | not (binder `usedIn` body_usage)    -- It's not mentioned
   = (body_usage, [])