Fix nasty recompilation bug in MkIface.computeChangedOccs

[ghc-hetmet.git] / compiler / iface / MkIface.lhs

diff --git a/compiler/iface/MkIface.lhs b/compiler/iface/MkIface.lhs
index f972a91..1521069 100644 (file)
--- a/compiler/iface/MkIface.lhs
+++ b/compiler/iface/MkIface.lhs
@@ -708,6 +708,8 @@ computeChangedOccs ver_fn this_module old_usages eq_info
     -- return True if an external name has changed
     name_changed :: Name -> Bool
     name_changed nm
+       | isWiredInName nm      -- Wired-in things don't get into interface
+       = False                 -- files and hence don't get into the ver_fn
         | Just ents <- lookupUFM usg_modmap (moduleName mod),
           Just v    <- lookupUFM ents parent_occ
         = v < new_version