(eval-when t ...)as a shorthand for
(eval-when (:compile-toplevel :load-toplevel :execute) ...), addressing concerns about verbosity. An ENHANCED-EVAL-WHEN alias is also supported, as well as an EVAL-ALWAYS macro and package nickname, for good measure.
As EVAL-WHEN with all situations specified is used an overwhelming majority of the time by most users, these shorthands can really come handy.
enhanced-eval-when is in Quicklisp: