+deSugar :: Module
+ -> UniqSupply
+ -> TcResults
+ -> IO ([CoreBind], [ProtoCoreRule], SDoc, SDoc, [CoreBndr])
+
+deSugar mod_name us (TcResults {tc_env = global_val_env,
+ tc_binds = all_binds,
+ tc_rules = rules,
+ tc_fords = fo_decls})
+ = do
+ beginPass "Desugar"
+ -- Do desugaring
+ let (result, ds_warns) =
+ initDs us global_val_env mod_name
+ (dsProgram mod_name all_binds rules fo_decls)
+ (ds_binds, ds_rules, _, _, _) = result
+
+ -- Display any warnings
+ doIfSet (not (isEmptyBag ds_warns))
+ (printErrs (pprBagOfWarnings ds_warns))
+
+ -- Lint result if necessary
+ endPass "Desugar" opt_D_dump_ds ds_binds
+
+ doIfSet opt_D_dump_ds (printDump (ppr_ds_rules ds_rules))
+
+ return result
+
+dsProgram mod_name all_binds rules fo_decls
+ = dsMonoBinds auto_scc all_binds [] `thenDs` \ core_prs ->
+ dsForeigns mod_name fo_decls `thenDs` \ (fe_binders, foreign_binds, h_code, c_code) ->
+ let
+ ds_binds = [Rec (foreign_binds ++ core_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#!
+
+ local_binders = mkVarSet (bindersOfBinds ds_binds)
+ in
+ mapDs (dsRule local_binders) rules `thenDs` \ rules' ->
+ returnDs (ds_binds, rules', h_code, c_code, fe_binders)
+ where
+ auto_scc | opt_SccProfilingOn = TopLevel
+ | otherwise = NoSccs
+
+ppr_ds_rules [] = empty
+ppr_ds_rules rules
+ = text "" $$ text "-------------- DESUGARED RULES -----------------" $$
+ vcat (map pprProtoCoreRule rules)
+\end{code}