The bracket function captures a common allocate, compute, deallocate idiom in which the deallocation step must occur even in the case of an error during computation. This is similar to try-catch-finally in Java.

This version handles only IO errors, as defined by Haskell 98. The version of bracket in Control.Exception handles all exceptions, and should be used instead.

A variant of bracket where the middle computation doesn't want x.

This version handles only IO errors, as defined by Haskell 98. The version of bracket_ in Control.Exception handles all exceptions, and should be used instead.