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Forwarded to https://ghc.haskell.org/trac/ghc/ticket/10424
Index: b/compiler/GHC/Iface/Recomp.hs
===================================================================
--- a/compiler/GHC/Iface/Recomp.hs
+++ b/compiler/GHC/Iface/Recomp.hs
@@ -1247,7 +1247,7 @@ addFingerprints hsc_env iface0
(mod_hash,
mi_src_hash iface0,
ann_fn (mkVarOccFS (fsLit "module")), -- See mkIfaceAnnCache
- mi_usages iface0,
+ usages,
sorted_deps,
mi_hpc iface0)
@@ -1282,6 +1282,8 @@ addFingerprints hsc_env iface0
(non_orph_rules, orph_rules) = mkOrphMap ifRuleOrph (mi_rules iface0)
(non_orph_fis, orph_fis) = mkOrphMap ifFamInstOrph (mi_fam_insts iface0)
ann_fn = mkIfaceAnnCache (mi_anns iface0)
+ -- Do not allow filenames to affect the interface
+ usages = [ case u of UsageFile _ fp fl -> UsageFile "" fp fl; _ -> u | u <- mi_usages iface0 ]
-- | Retrieve the orphan hashes 'mi_orphan_hash' for a list of modules
-- (in particular, the orphan modules which are transitively imported by the
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