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This is the mainPrimIO13 that must be used for Haskell~1.3.
\begin{code}
module Main ( mainPrimIO13 ) where
import PreludeMain13_help -- for type of "Main.main"
import Builtin ( error )
import PreludeIO
import UTypes ( Bin )
import Cls
import Core
import IChar
import IInt
import IList
import List ( (++) )
import Prel ( (.), not )
import PS ( _PackedString, _unpackPS )
import Text
mainPrimIO13 :: PrimIO ()
mainPrimIO13 s
= case (main s) of { (result, s2@(S# _)) ->
case result of
Right () -> ( (), s2 )
Left err -> error ("I/O error: "++shows err "\n")
}
\end{code}
OLD COMMENT:
Nota Bene! @mainIO@ is written as an explicit function, rather than
by saying: @mainIO = requestToIO main@ so that the code generator
recognises @mainIO@ as a {\em function} (hence HNF, hence not
updatable), rather than a zero-arity CAF (hence updatable). If it is
updated, then we have a mega-space leak, because the entire action
(@requestToIO main@) is retained indefinitely.
(This doesn't waste work because @mainIO@ is only used once.)
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