[project @ 1996-05-01 18:36:59 by partain]

[ghc-hetmet.git] / ghc / compiler / coreSyn / PprCore.lhs

diff --git a/ghc/compiler/coreSyn/PprCore.lhs b/ghc/compiler/coreSyn/PprCore.lhs
index 8e1c73d..20f0b4d 100644 (file)
--- a/ghc/compiler/coreSyn/PprCore.lhs
+++ b/ghc/compiler/coreSyn/PprCore.lhs
@@ -17,7 +17,7 @@ module PprCore (
        pprTypedCoreBinder
        
        -- these are here to make the instances go in 0.26:
-#if __GLASGOW_HASKELL__ <= 26
+#if __GLASGOW_HASKELL__ <= 30
        , GenCoreBinding, GenCoreExpr, GenCoreCaseAlts
        , GenCoreCaseDefault, GenCoreArg
 #endif
@@ -27,7 +27,7 @@ import Ubiq{-uitous-}
 
 import CoreSyn
 import CostCentre      ( showCostCentre )
-import Id              ( idType, getIdInfo, getIdStrictness,
+import Id              ( idType, getIdInfo, getIdStrictness, isTupleCon,
                          nullIdEnv, DataCon(..), GenId{-instances-}
                        )
 import IdInfo          ( ppIdInfo, StrictnessInfo(..) )
@@ -296,6 +296,13 @@ ppr_expr pe (Let bind expr)
 ppr_expr pe (SCC cc expr)
   = ppSep [ppCat [ppPStr SLIT("_scc_"), pSCC pe cc],
           ppr_parend_expr pe expr ]
+
+ppr_expr pe (Coerce c ty expr)
+  = ppSep [ppCat [ppPStr SLIT("_coerce_"), pp_coerce c],
+          pTy pe ty, ppr_parend_expr pe expr ]
+  where
+    pp_coerce (CoerceIn  v) = ppBeside (ppStr "{-in-}")  (ppr (pStyle pe) v)
+    pp_coerce (CoerceOut v) = ppBeside (ppStr "{-out-}") (ppr (pStyle pe) v)
 \end{code}
 
 \begin{code}
@@ -303,9 +310,14 @@ ppr_alts pe (AlgAlts alts deflt)
   = ppAboves [ ppAboves (map ppr_alt alts), ppr_default pe deflt ]
   where
     ppr_alt (con, params, expr)
-      = ppHang (ppCat [ppr_con con (pCon pe con),
-                      ppInterleave ppSP (map (pMinBndr pe) params),
-                      ppStr "->"])
+      = ppHang (if isTupleCon con then
+                   ppCat [ppParens (ppInterleave ppComma (map (pMinBndr pe) params)),
+                          ppStr "->"]
+               else
+                   ppCat [ppr_con con (pCon pe con),
+                          ppInterleave ppSP (map (pMinBndr pe) params),
+                          ppStr "->"]
+              )
             4 (ppr_expr pe expr)
       where
        ppr_con con pp_con