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-rw-r--r--compiler/main/Packages.hs-boot2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/main/Packages.hs-boot b/compiler/main/Packages.hs-boot
index 2f898f19d3..f2343b66c9 100644
--- a/compiler/main/Packages.hs-boot
+++ b/compiler/main/Packages.hs-boot
@@ -3,4 +3,4 @@ module Packages where
import {-# SOURCE #-} Module (PackageKey)
import {-# SOURCE #-} DynFlags (DynFlags)
data PackageState
-packageKeyPackageIdString :: DynFlags -> PackageKey -> String
+packageKeyPackageIdString :: DynFlags -> PackageKey -> Maybe String