Perl module that allows swapping the currently compiling file for a new one

 goto::file allows Test2::Harness to swap out the main script for the new
 file without adding a stack frame.
 .
 It is rare, but there are times where you want to swap out the currently
 compiling file for a different one. This module does that. From the point
 you 'use' the module perl will be parsing the new file instead of the
 original.
 .
 This module was created specifically for Test2::Harness which can preload
 modules and fork to run each test. The problem was that using 'do' to execute
 the test files post-fork was resuling in extra frames in the stack trace...
 in other words there are a lot of tests that assume the test file is the
 bottom of the stack. This happens all the time, specially if stack traces
 need to be verified.