error -mtl

error :: [Char] -> a
base Prelude
error stops execution and displays an error message.
ErrorCall :: String -> ErrorCall
base Control.Exception.Base, base Control.Exception
ErrorCall :: String -> Exception
base Control.OldException
The ErrorCall exception is thrown by error. The String argument of ErrorCall is the string passed to error when it was called.
data ErrorCall
base Control.Exception.Base, base Control.Exception
This is thrown when the user calls error. The String is the argument given to error.
errorCalls :: Exception -> Maybe String
base Control.OldException
module Foreign.C.Error
base Foreign.C.Error
C-specific Marshalling support: Handling of C "errno" error codes.
module Foreign.Marshal.Error
base Foreign.Marshal.Error
Routines for testing return values and raising a userError exception in case of values indicating an error state.
module System.IO.Error
base System.IO.Error
Standard IO Errors.
module Control.Monad.Trans.Error
transformers Control.Monad.Trans.Error
This monad transformer adds the ability to fail or throw exceptions to a monad. A sequence of actions succeeds, producing a value, only if all the actions in the sequence are successful. If one fails with an error, the rest of the sequence is skipped and the composite action fails with that error. If the value of the error is not required, the variant in Control.Monad.Trans.Maybe may be used instead.
module Data.Text.Encoding.Error
text Data.Text.Encoding.Error
Types and functions for dealing with encoding and decoding errors in Unicode text. The standard functions for encoding and decoding text are strict, which is to say that they throw exceptions on invalid input. This is often unhelpful on real world input, so alternative functions exist that accept custom handlers for dealing with invalid inputs. These OnError handlers are normal Haskell functions. You can use one of the presupplied functions in this module, or you can write a custom handler of your own.
Error :: ErrorCategory -> String -> Error
OpenGL Graphics.Rendering.OpenGL.GLU.Errors
Error :: ParseError -> Reply s u a
parsec Text.Parsec.Prim
class Error a
transformers Control.Monad.Trans.Error, mtl Control.Monad.Error.Class, mtl Control.Monad.Error
An exception to be thrown. Minimal complete definition: noMsg or strMsg.
data Error
OpenGL Graphics.Rendering.OpenGL.GLU.Errors
GL/GLU errors consist of a general error category and a description of what went wrong.
package error-location
package
Deprecated- now called file-location. http://hackage.haskell.org/package/file-location Version 0.1.5.5
package error-message
package
This philosophy behind this package is that it is often better to find out all of the errors that have occured in a computation and report them simultaneously, rather than aborting as soon as the first error is encountered.  Towards this end, this module supplies a type of combinable error messages so that all of the errors from subcomputations can be gathered and presented together. New in version 1.1:  Removed Monoid instance for Doc (it should now be supplied by ansi-wl-pprint), added ErrorMessageOr type alias. Version 1.1
data ErrorCategory
OpenGL Graphics.Rendering.OpenGL.GLU.Errors
General GL/GLU error categories
ErrorClosed :: ConnError
HTTP Network.Stream
errorIsUnknown :: ParseError -> Bool
parsec Text.Parsec.Error, parsec Text.ParserCombinators.Parsec.Error
class ErrorList a
transformers Control.Monad.Trans.Error
Workaround so that we can have a Haskell 98 instance Error String.

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