do-all-symbols

(do-all-symbols (var [result]) body...)

Evaluates the body once per distinct symbol accessible in any registered package, with var bound to the symbol, then evaluates result with var bound to nil and returns its value (nil when no result form is given). Each symbol is visited once and spelled the way code spells it, exactly the universe find-all-symbols searches. A return in the body exits the whole form, skipping the result, like the other iteration macros.