[project @ 2002-07-30 11:49:17 by simonpj]

[ghc-hetmet.git] / ghc / compiler / main / TidyPgm.lhs

diff --git a/ghc/compiler/main/TidyPgm.lhs b/ghc/compiler/main/TidyPgm.lhs
index 8c57005..bacbee4 100644 (file)
--- a/ghc/compiler/main/TidyPgm.lhs
+++ b/ghc/compiler/main/TidyPgm.lhs
@@ -493,7 +493,7 @@ tidyTopBinder mod ext_ids cg_info_env rec_tidy_env rhs tidy_rhs
 
 tidyTopIdInfo tidy_env is_external idinfo unfold_info arity cg_info
   | opt_OmitInterfacePragmas   -- If the interface file has no pragma info
-  = vanillaIdInfo              -- then discard all info right here
+  = hasCafIdInfo               -- then discard all info right here
        -- This is not so important for *this* module, but it's
        -- vital for ghc --make:
        --   subsequent compilations must not see (e.g.) the arity if
@@ -501,11 +501,16 @@ tidyTopIdInfo tidy_env is_external idinfo unfold_info arity cg_info
        -- If they do, they'll exploit the arity; then the arity might
        -- change, but the iface file doesn't change => recompilation
        -- does not happen => disaster
+       --
+       -- This IdInfo will live long-term in the Id => need to make
+       -- conservative assumption about Caf-hood
 
   | not is_external    -- For internal Ids (not externally visible)
   = vanillaIdInfo      -- we only need enough info for code generation
                        -- Arity and strictness info are enough;
                        --      c.f. CoreTidy.tidyLetBndr
+       -- Use vanillaIdInfo (whose CafInfo is a panic) because we 
+       -- should not need the CafInfo
        `setArityInfo`         arity
        `setAllStrictnessInfo` newStrictnessInfo idinfo