diff --git a/src/Core/Lex.x b/src/Core/Lex.x
index d86dded..89cbd31 100644
--- a/src/Core/Lex.x
+++ b/src/Core/Lex.x
@@ -76,6 +76,7 @@ rlp :-
     "module"                { constTok TokenModule }
     "in"                    { constTok TokenIn }
     "where"                 { constTok TokenWhere }
+    "Pack"                  { constTok TokenPack } -- temp
 
     "\\"                    { constTok TokenLambda }
     "λ"                     { constTok TokenLambda }
@@ -106,6 +107,7 @@ data CoreToken = TokenLet
                | TokenModule
                | TokenWhere
                | TokenComma
+               | TokenPack -- temp
                | TokenCase
                | TokenOf
                | TokenLambda
diff --git a/src/Core/Parse.y b/src/Core/Parse.y
index 7082216..ff36be7 100644
--- a/src/Core/Parse.y
+++ b/src/Core/Parse.y
@@ -36,6 +36,8 @@ import Data.Default.Class   (def)
       where           { Located _ _ _ TokenWhere }
       case            { Located _ _ _ TokenCase }
       of              { Located _ _ _ TokenOf }
+      ','             { Located _ _ _ TokenComma }
+      pack            { Located _ _ _ TokenPack } -- temp
       in              { Located _ _ _ TokenIn }
       litint          { Located _ _ _ (TokenLitInt $$) }
       varname         { Located _ _ _ (TokenVarName $$) }
@@ -119,8 +121,12 @@ Alter           : litint ParList '->' Expr      { Alter $1 $2 $4 }
 Expr1           :: { Expr }
 Expr1           : litint                        { IntE $1 }
                 | Id                            { Var $1 }
+                | PackCon                       { $1 }
                 | '(' Expr ')'                  { $2 }
 
+PackCon         :: { Expr }
+PackCon         : pack '{' litint ',' litint '}' { Con $3 $5 }
+
 Bindings        :: { [Binding] }
 Bindings        : Binding ';' Bindings          { $1 : $3 }
                 | Binding ';'                   { [$1] }