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%
% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
%
\section[TcIfaceSig]{Type checking of type signatures in interface files}
\begin{code}
#include "HsVersions.h"
module TcIfaceSig ( tcInterfaceSigs ) where
import Ubiq
import TcMonad
import TcMonoType ( tcPolyType )
import HsSyn ( Sig(..), PolyType )
import RnHsSyn ( RenamedSig(..) )
import CmdLineOpts ( opt_CompilingPrelude )
import Id ( mkImported )
import Name ( Name(..) )
import Pretty
import Util ( panic )
--import TcPragmas ( tcGenPragmas )
import IdInfo ( noIdInfo )
tcGenPragmas ty id ps = returnNF_Tc noIdInfo
\end{code}
Ultimately, type signatures in interfaces will have pragmatic
information attached, so it is a good idea to have separate code to
check them.
As always, we do not have to worry about user-pragmas in interface
signatures.
\begin{code}
tcInterfaceSigs :: [RenamedSig] -> TcM s [Id]
tcInterfaceSigs [] = returnTc []
tcInterfaceSigs (Sig name@(ValName uniq full_name) ty pragmas src_loc : sigs)
= tcAddSrcLoc src_loc (
tcPolyType ty `thenTc` \ sigma_ty ->
fixTc ( \ rec_id ->
tcGenPragmas (Just sigma_ty) rec_id pragmas
`thenNF_Tc` \ id_info ->
returnTc (mkImported uniq full_name sigma_ty id_info)
)) `thenTc` \ id ->
tcInterfaceSigs sigs `thenTc` \ sigs' ->
returnTc (id:sigs')
tcInterfaceSigs (Sig odd_name _ _ src_loc : sigs)
= case odd_name of
WiredInVal _ | opt_CompilingPrelude
-> tcInterfaceSigs sigs
_ -> tcAddSrcLoc src_loc $
failTc (ifaceSigNameErr odd_name)
ifaceSigNameErr name sty
= ppHang (ppStr "Bad name in an interface type signature (a Prelude name?)")
4 (ppr sty name)
\end{code}
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