[project @ 2004-02-24 15:57:52 by simonpj]

[ghc-hetmet.git] / ghc / compiler / typecheck / TcRnMonad.lhs

diff --git a/ghc/compiler/typecheck/TcRnMonad.lhs b/ghc/compiler/typecheck/TcRnMonad.lhs
index 86af49a..fe410c6 100644 (file)
--- a/ghc/compiler/typecheck/TcRnMonad.lhs
+++ b/ghc/compiler/typecheck/TcRnMonad.lhs
@@ -74,6 +74,7 @@ initTc hsc_env mod do_this
        tvs_var      <- newIORef emptyVarSet ;
        type_env_var <- newIORef emptyNameEnv ;
        dfuns_var    <- newIORef emptyNameSet ;
+       th_var       <- newIORef False ;
 
        let {
             gbl_env = TcGblEnv {
@@ -85,6 +86,7 @@ initTc hsc_env mod do_this
                tcg_type_env_var = type_env_var,
                tcg_inst_env  = mkImpInstEnv hsc_env,
                tcg_inst_uses = dfuns_var,
+               tcg_th_used   = th_var,
                tcg_exports  = emptyNameSet,
                tcg_imports  = init_imports,
                tcg_dus      = emptyDUs,
@@ -733,6 +735,9 @@ setLclTypeEnv lcl_env thing_inside
 %************************************************************************
 
 \begin{code}
+recordThUse :: TcM ()
+recordThUse = do { env <- getGblEnv; writeMutVar (tcg_th_used env) True }
+
 getStage :: TcM ThStage
 getStage = do { env <- getLclEnv; return (tcl_th_ctxt env) }