This module lets you defer actions at run-time that will take place when the control flow returns into an upper scope. Currently, you can: - hook an upper scope end with "reap" ; - localize variables, array/hash values or deletions of elements in higher contexts with respectively "localize", "localize_elem" and "localize_delete" ; - return values immediately to an upper level with "unwind", "yield" and "leave" ; - gather information about an upper context with "want_at" and "context_info" ; - execute a subroutine in the setting of an upper subroutine stack frame with "uplevel" ; - uniquely identify contexts with "uid" and "validate_uid".