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

diff --git a/compiler/typecheck/TcSplice.lhs b/compiler/typecheck/TcSplice.lhs
index b71294f..e23155d 100644 (file)
--- a/compiler/typecheck/TcSplice.lhs
+++ b/compiler/typecheck/TcSplice.lhs
@@ -52,6 +52,7 @@ import ErrUtils
 import SrcLoc
 import Outputable
 import Unique
+import DynFlags
 import PackageConfig
 import BasicTypes
 import Panic
@@ -76,6 +77,7 @@ import Control.Monad  ( liftM )
 tcSpliceDecls :: LHsExpr Name -> TcM [LHsDecl RdrName]
 tcSpliceExpr  :: HsSplice Name -> BoxyRhoType -> TcM (HsExpr TcId)
 kcSpliceType  :: HsSplice Name -> TcM (HsType Name, TcKind)
+       -- None of these functions add constraints to the LIE
 
 #ifndef GHCI
 tcSpliceExpr n e ty = pprPanic "Cant do tcSpliceExpr without GHCi" (ppr e)
@@ -89,6 +91,18 @@ tcSpliceDecls e     = pprPanic "Cant do tcSpliceDecls without GHCi" (ppr e)
 %*                                                                     *
 %************************************************************************
 
+Note [Handling brackets]
+~~~~~~~~~~~~~~~~~~~~~~~~
+Source:                f = [| Just $(g 3) |]
+  The [| |] part is a HsBracket
+
+Typechecked:   f = [| Just ${s7}(g 3) |]{s7 = g Int 3}
+  The [| |] part is a HsBracketOut, containing *renamed* (not typechecked) expression
+  The "s7" is the "splice point"; the (g Int 3) part is a typechecked expression
+
+Desugared:     f = do { s7 <- g Int 3
+                      ; return (ConE "Data.Maybe.Just" s7) }
+
 \begin{code}
 tcBracket :: HsBracket Name -> BoxyRhoType -> TcM (LHsExpr TcId)
 tcBracket brack res_ty
@@ -362,8 +376,11 @@ runMeta :: (SrcSpan -> th_syn -> Either Message hs_syn)
        -> TcM hs_syn           -- Of type t
 runMeta convert expr
   = do {       -- Desugar
+#if defined(GHCI) && defined(DEBUGGER)
+         ds_expr <- unsetOptM Opt_Debugging $ initDsTc (dsLExpr expr)
+#else 
          ds_expr <- initDsTc (dsLExpr expr)
-
+#endif
        -- Compile and link it; might fail if linking fails
        ; hsc_env <- getTopEnv
        ; src_span <- getSrcSpanM