I'm assuming λ is a macro that expands into a lambda that does (RETURN <something>). Indeed I've changed RETURN to try to work like it does in CL. If there's no nil block it will still work, but issue a warning to encourage people to change their code. An easy way to get around this warning in your case is to make λ wrap its body in a (block nil ...). Vladimir 2010/12/6 Daniel Gackle <danielgackle@gmail.com>:
(1) The following expression generates the correct code: (defun blah () (λ () (foo 123))) But it also emits "Warning: Returning from unknown block NILBLOCK", which is undeserved. (2) It's not clear how to do explicit return from a lambda now. That is, (defun blah () (λ () (when (foo) (return 123)) ;; do some other stuff )) generates the same warning as above. Is this just a bug, or is it suggesting that one must explicitly declare a scope using (BLOCK NIL...) in order to do an explicit return warning-free? I'm hoping not the latter.
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