X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Ftypecheck%2FTcSplice.lhs;h=e23155d0de4ff22c6641cfed9c3a0a44a8f67170;hb=276a45241d59c991af9ddf4e643c750cfa5f45a7;hp=a99bf8b9e24ef1f5247cc31abbc8d149d21dad3c;hpb=8b08c15b8ace5a76e341939081fbb6ad2736ddd1;p=ghc-hetmet.git

diff --git a/compiler/typecheck/TcSplice.lhs b/compiler/typecheck/TcSplice.lhs
index a99bf8b..e23155d 100644
--- a/compiler/typecheck/TcSplice.lhs
+++ b/compiler/typecheck/TcSplice.lhs
@@ -91,6 +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