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-rw-r--r--compiler/iface/MkIface.lhs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/iface/MkIface.lhs b/compiler/iface/MkIface.lhs
index 2c106b0a1a..0bfdae7b1d 100644
--- a/compiler/iface/MkIface.lhs
+++ b/compiler/iface/MkIface.lhs
@@ -399,7 +399,7 @@ addFingerprints hsc_env mb_old_fingerprint iface0 new_decls
, let out = localOccs $ freeNamesDeclABI abi
]
- name_module n = ASSERT( isExternalName n ) nameModule n
+ name_module n = ASSERT2( isExternalName n, ppr n ) nameModule n
localOccs = map (getUnique . getParent . getOccName)
. filter ((== this_mod) . name_module)
. nameSetToList