On Sat, Feb 27, 2010 at 5:07 PM, zaxis <z_a...@163.com> wrote: > > xxxMain = do > timeout <- getEnv "xxx_TIMEOUT" > case timeout of > Just str | [(t, _)] <- reads str -> do > addTimeout t (hPutStrLn stderr "*** TIMEOUT" >> _exit 1) > return () > _ -> return () > ....... > > What does the `|` mean in "Just str | [(t, _)] <- reads str" ? > Is it a logical `or` ?
It's part of a case expression, see http://www.haskell.org/onlinereport/exps.html#sect3.13 lee _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
