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{-# LANGUAGE Trustworthy #-}
{-# LANGUAGE NoImplicitPrelude, MagicHash, ImplicitParams #-}
{-# OPTIONS_HADDOCK hide #-}
-----------------------------------------------------------------------------
-- |
-- Module : GHC.Err
-- Copyright : (c) The University of Glasgow, 1994-2002
-- License : see libraries/base/LICENSE
--
-- Maintainer : cvs-ghc@haskell.org
-- Stability : internal
-- Portability : non-portable (GHC extensions)
--
-- The "GHC.Err" module defines the code for the wired-in error functions,
-- which have a special type in the compiler (with \"open tyvars\").
--
-- We cannot define these functions in a module where they might be used
-- (e.g., "GHC.Base"), because the magical wired-in type will get confused
-- with what the typechecker figures out.
--
-----------------------------------------------------------------------------
module GHC.Err( absentErr, error, undefined ) where
import GHC.CString ()
import GHC.Types (Char)
import GHC.Stack.Types
import GHC.Prim
import GHC.Integer () -- Make sure Integer is compiled first
-- because GHC depends on it in a wired-in way
-- so the build system doesn't see the dependency
import {-# SOURCE #-} GHC.Exception( errorCallWithCallStackException )
-- | 'error' stops execution and displays an error message.
error :: (?callStack :: CallStack) => [Char] -> a
error s = raise# (errorCallWithCallStackException s ?callStack)
-- | A special case of 'error'.
-- It is expected that compilers will recognize this and insert error
-- messages which are more appropriate to the context in which 'undefined'
-- appears.
undefined :: (?callStack :: CallStack) => a
undefined = error "Prelude.undefined"
-- | Used for compiler-generated error message;
-- encoding saves bytes of string junk.
absentErr :: a
absentErr = error "Oops! The program has entered an `absent' argument!\n"
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