readLn package:ghc-internal

readLn :: Read a => IO a
ghc-internal GHC.Internal.System.IO
The readLn function combines getLine and readIO. This operation may fail with the same errors as getLine and readIO.

Examples

>>> fmap (+ 5) readLn
> 25
30

>>> readLn :: IO String
> this is not a string literal
*** Exception: user error (Prelude.readIO: no parse)