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Diffstat (limited to 'compiler/utils/Outputable.hs')
| -rw-r--r-- | compiler/utils/Outputable.hs | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/compiler/utils/Outputable.hs b/compiler/utils/Outputable.hs index 6c7ae08379..c557224fc1 100644 --- a/compiler/utils/Outputable.hs +++ b/compiler/utils/Outputable.hs @@ -105,6 +105,7 @@ import Data.Word import System.IO ( Handle ) import System.FilePath import Text.Printf +import Data.Graph (SCC(..)) import GHC.Fingerprint import GHC.Show ( showMultiLineString ) @@ -769,6 +770,10 @@ instance (Outputable elt) => Outputable (IM.IntMap elt) where instance Outputable Fingerprint where ppr (Fingerprint w1 w2) = text (printf "%016x%016x" w1 w2) +instance Outputable a => Outputable (SCC a) where + ppr (AcyclicSCC v) = text "NONREC" $$ (nest 3 (ppr v)) + ppr (CyclicSCC vs) = text "REC" $$ (nest 3 (vcat (map ppr vs))) + {- ************************************************************************ * * |