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I am new to haskell and I am having difficulty compiling the following function definition
chaseFile :: [FilePath] -- ^ path (directories to search) -> String -- ^ base name -> [String] -- ^ possible extensions -> IO String -- ^ contents of file chaseFile dirs basename exts = do results <- mapM tryReadFile fnames case dropWhile hasFailed results of ((Right (fc,fn)):_) -> errLn ("Read file: "++fn) >> return fc _ -> errLn ("Could not find file: "++basename) >> mzero where fnames = [d++'/':basename++'.':e | d <- dirs, e <- exts] hasFailed (Left _) = True hasFailed _ = False tryReadFile fn = try ( readFile fn >>= \fc -> return (fc,fn) )
The compiler gives the following error
Not in scope: 'try'
Thanks in anticiption