GHC.Err.Located

Documentation

error :: HasCallStack => [Char] -> a

error stops execution and displays an error message.

undefined :: HasCallStack => a

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.

type HasCallStack = ?callStack :: CallStack

Request a CallStack.

NOTE: The implicit parameter ?callStack :: CallStack is an implementation detail and should not be considered part of the CallStack API, we may decide to change the implementation in the future.

Since: 4.9.0.0

showCallStack :: CallStack -> String

Deprecated: use GHC.Stack.prettyCallStack instead