[Haskell-cafe] symbol $

[Maverick]

Hi 

Do you mind tell what is mean by the symbol $ in this piece of code? Thanks
a lot. 

> mcompile              :: Prog -> State Int Code
> mcompile (Assign n e) = return $ compileExpr e ++ [POP n]
> mcompile (If e p1 p2) = do cur <- fresh 
>		             pp1 <- mcompile p1
>			     pp2 <- mcompile p2
>                            return $ (compileExpr e ++ (JUMPZ cur):pp1 ++
> JUMP (cur+1):(LABEL cur):pp2 ++ [LABEL (cur+1)])
> mcompile (While e p)  = do cur <- fresh
>			     mp <- mcompile p
>			     return $ [LABEL cur] ++ compileExpr e ++ [JUMPZ (cur+1)] ++ mp ++
[JUMP cur,LABEL (cur+1)] 
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