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) |

Safe Haskell | Trustworthy |

Language | Haskell2010 |

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.

## Synopsis

- absentErr :: a
- error :: forall (r :: RuntimeRep). forall (a :: TYPE r). HasCallStack => [Char] -> a
- errorWithoutStackTrace :: forall (r :: RuntimeRep). forall (a :: TYPE r). [Char] -> a
- undefined :: forall (r :: RuntimeRep). forall (a :: TYPE r). HasCallStack => a

# Documentation

Used for compiler-generated error message; encoding saves bytes of string junk.

error :: forall (r :: RuntimeRep). forall (a :: TYPE r). HasCallStack => [Char] -> a Source #

`error`

stops execution and displays an error message.

errorWithoutStackTrace :: forall (r :: RuntimeRep). forall (a :: TYPE r). [Char] -> a Source #

A variant of `error`

that does not produce a stack trace.

*Since: base-4.9.0.0*

undefined :: forall (r :: RuntimeRep). forall (a :: TYPE r). HasCallStack => a Source #