+deSugar :: HscEnv -> TcGblEnv -> IO (Bag WarnMsg, Maybe ModGuts)
+-- Can modify PCS by faulting in more declarations
+
+deSugar hsc_env
+ tcg_env@(TcGblEnv { tcg_mod = mod,
+ tcg_type_env = type_env,
+ tcg_imports = imports,
+ tcg_exports = exports,
+ tcg_dus = dus,
+ tcg_inst_uses = dfun_uses_var,
+ tcg_th_used = th_var,
+ tcg_keep = keep_var,
+ tcg_rdr_env = rdr_env,
+ tcg_fix_env = fix_env,
+ tcg_deprecs = deprecs,
+ tcg_binds = binds,
+ tcg_fords = fords,
+ tcg_rules = rules,
+ tcg_insts = insts })
+ = do { showPass dflags "Desugar"
+
+ -- Desugar the program
+ ; ((all_prs, ds_rules, ds_fords), warns)
+ <- initDs hsc_env mod rdr_env type_env $ do
+ { core_prs <- dsHsBinds auto_scc binds []
+ ; (ds_fords, foreign_prs) <- dsForeigns fords
+ ; let all_prs = foreign_prs ++ core_prs
+ local_bndrs = mkVarSet (map fst all_prs)
+ ; ds_rules <- mappM (dsRule mod local_bndrs) rules
+ ; return (all_prs, ds_rules, ds_fords) }
+
+
+
+ -- If warnings are considered errors, leave.
+ ; if errorsFound dflags (warns, emptyBag)
+ then return (warns, Nothing)
+ else do
+
+ { -- Add export flags to bindings
+ keep_alive <- readIORef keep_var
+ ; let final_prs = addExportFlags ghci_mode exports keep_alive
+ all_prs ds_rules
+ ds_binds = [Rec final_prs]
+ -- Notice that we put the whole lot in a big Rec, even the foreign binds
+ -- When compiling PrelFloat, which defines data Float = F# Float#
+ -- we want F# to be in scope in the foreign marshalling code!
+ -- You might think it doesn't matter, but the simplifier brings all top-level
+ -- things into the in-scope set before simplifying; so we get no unfolding for F#!
+
+ -- Lint result if necessary
+ ; endPass dflags "Desugar" Opt_D_dump_ds ds_binds
+
+ -- Dump output
+ ; doIfSet (dopt Opt_D_dump_ds dflags)
+ (printDump (ppr_ds_rules ds_rules))
+
+ ; dfun_uses <- readIORef dfun_uses_var -- What dfuns are used
+ ; th_used <- readIORef th_var -- Whether TH is used
+ ; let used_names = allUses dus `unionNameSets` dfun_uses
+ thPackage = thPackageId (pkgState dflags)
+ pkgs | Just th_id <- thPackage, th_used
+ = insertList th_id (imp_dep_pkgs imports)
+ | otherwise
+ = imp_dep_pkgs imports
+
+ dep_mods = moduleEnvElts (delModuleEnv (imp_dep_mods imports) mod)
+ -- M.hi-boot can be in the imp_dep_mods, but we must remove
+ -- it before recording the modules on which this one depends!
+ -- (We want to retain M.hi-boot in imp_dep_mods so that
+ -- loadHiBootInterface can see if M's direct imports depend
+ -- on M.hi-boot, and hence that we should do the hi-boot consistency
+ -- check.)
+
+ dir_imp_mods = imp_mods imports
+
+ ; usages <- mkUsageInfo hsc_env dir_imp_mods dep_mods used_names
+
+ ; let
+ -- Modules don't compare lexicographically usually,
+ -- but we want them to do so here.
+ le_mod :: Module -> Module -> Bool
+ le_mod m1 m2 = moduleFS m1 <= moduleFS m2
+ le_dep_mod :: (Module, IsBootInterface) -> (Module, IsBootInterface) -> Bool
+ le_dep_mod (m1,_) (m2,_) = m1 `le_mod` m2
+
+ deps = Deps { dep_mods = sortLe le_dep_mod dep_mods,
+ dep_pkgs = sortLe (<=) pkgs,
+ dep_orphs = sortLe le_mod (imp_orphs imports) }
+ -- sort to get into canonical order
+
+ mod_guts = ModGuts {
+ mg_module = mod,
+ mg_exports = exports,
+ mg_deps = deps,
+ mg_usages = usages,
+ mg_dir_imps = [m | (m,_,_) <- moduleEnvElts dir_imp_mods],
+ mg_rdr_env = rdr_env,
+ mg_fix_env = fix_env,
+ mg_deprecs = deprecs,
+ mg_types = type_env,
+ mg_insts = insts,
+ mg_rules = ds_rules,
+ mg_binds = ds_binds,
+ mg_foreign = ds_fords }
+
+ ; return (warns, Just mod_guts)
+ }}
+
+ where
+ dflags = hsc_dflags hsc_env
+ ghci_mode = hsc_mode hsc_env
+ auto_scc | opt_SccProfilingOn = TopLevel
+ | otherwise = NoSccs
+
+deSugarExpr :: HscEnv
+ -> Module -> GlobalRdrEnv -> TypeEnv
+ -> LHsExpr Id
+ -> IO CoreExpr
+deSugarExpr hsc_env this_mod rdr_env type_env tc_expr
+ = do { showPass dflags "Desugar"
+ ; us <- mkSplitUniqSupply 'd'
+