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-rw-r--r--src/CabalHelper/Compiletime/Program/GHC.hs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/CabalHelper/Compiletime/Program/GHC.hs b/src/CabalHelper/Compiletime/Program/GHC.hs
index 97b04ed..644c6ec 100644
--- a/src/CabalHelper/Compiletime/Program/GHC.hs
+++ b/src/CabalHelper/Compiletime/Program/GHC.hs
@@ -124,6 +124,7 @@ cabalVersionExistsInPkgDb cabalVer db@(PackageDbDir db_path) = do
return $
case (cabalVer, vers) of
(CabalVersion ver, _) -> ver `elem` vers
+ (CabalHEAD _, []) -> False
(CabalHEAD _, [_headver]) -> True
(CabalHEAD _, _) ->
error $ msg ++ db_path)