diff --git a/hsrc/Syntax/Lexer.x b/hsrc/Syntax/Lexer.x
index 640c0ea..d97838c 100644
--- a/hsrc/Syntax/Lexer.x
+++ b/hsrc/Syntax/Lexer.x
@@ -40,7 +40,9 @@ $escape_char = [abfnrtv'\"\\]
 
 -- Identifier
   $typestart $identrest*                           { emitS TokTypeIdent }
+  "prim%" $typestart $identrest*                   { emitS TokTypeIdent }
   $valstart $identrest*                            { emitS TokValIdent  }
+  "prim%" $valstart $identrest*                    { emitS TokValIdent  }
   $opident+                                        { emitS TokOpIdent   }
   ":"+                                             { emitS TokOpIdent   }
 
@@ -60,6 +62,7 @@ $escape_char = [abfnrtv'\"\\]
   ";"                                             { emitT Semi    }
   ","                                             { emitT Comma   }
   "`"                                             { emitT BTick   }
+  [\\]                                            { emitT LLambda }
 
 {
 
diff --git a/hsrc/Syntax/Parser.y b/hsrc/Syntax/Parser.y
index f76767c..4b7913f 100644
--- a/hsrc/Syntax/Parser.y
+++ b/hsrc/Syntax/Parser.y
@@ -38,7 +38,7 @@ import qualified Codec.Binary.UTF8.Generic as UTF8
   '->'       { Lexeme $$ (TokOpIdent  "->")       }
   '@'        { Lexeme $$ (TokOpIdent  "@")       }
   '::'       { Lexeme $$ (TokOpIdent  "::")       }
-  '\\'       { Lexeme $$ (TokOpIdent  "\\")       }
+  '\\'       { Lexeme $$ LLambda  }
   '('        { Lexeme $$ LParen  }
   ')'        { Lexeme $$ RParen  }
   '['        { Lexeme $$ LSquare }
diff --git a/hsrc/Syntax/ParserCore.hs b/hsrc/Syntax/ParserCore.hs
index 15060f1..1d60323 100644
--- a/hsrc/Syntax/ParserCore.hs
+++ b/hsrc/Syntax/ParserCore.hs
@@ -6,6 +6,7 @@ module Syntax.ParserCore where
 import Control.Applicative(Applicative)
 import qualified Data.ByteString as S
 import MonadLib
+import System.IO
 
 -- --------------------------------------------------------------------------
 -- Positions
@@ -37,7 +38,7 @@ pprtPosition p = posFile p ++ ":" ++ show (posLine p) ++ ":" ++ show (posCol p)
 data Token = LParen | RParen
            | LSquare | RSquare
            | LBrace | RBrace
-           | Bar | Semi | Comma | BTick
+           | Bar | Semi | Comma | BTick | LLambda
            | TokTypeIdent String
            | TokValIdent String
            | TokOpIdent String
@@ -74,7 +75,7 @@ data Error = Error ErrorType String Position
  deriving (Show)
 
 printError :: Error -> IO ()
-printError (Error etype str pos) = putStrLn errstr
+printError (Error etype str pos) = hPutStrLn stderr errstr
  where
   errstr = pprtPosition pos ++ ":" ++ etypeStr ++ ": " ++ str
   etypeStr = case etype of