return-from

(return-from name [value])

Returns value (default nil) from the enclosing block named name. A defun body is a block named after the function and a defmethod body one named after its generic, so a return-from exits the function even from inside a do/loop (whose implicit block is named nil); (return-from nil v) is (return v). A same-function return-from compiles to a direct jump. A return-from inside a lambda that names an enclosing block — for example inside a lambda passed to mapcar/mapl — exits that block as a non-local exit on every backend, matching Common Lisp. (Such a cross-lambda exit compiles in exception-handling mode on the WASM backends. A return-from that would have to cross an flet/labels local function is not yet supported on the compilers.)