That's the point. Empty lazy sequence doesn't work, but not empty lazy sequence works.
On 2月15日, 上午9时44分, Armando Blancas <abm221...@gmail.com> wrote: > eval doesn't mind lazy seqs as input: > > user=> (map identity ['quote ()]) > (quote ()) > user=> (class (map identity ['quote ()])) > clojure.lang.LazySeq > user=> (eval (map identity ['quote ()])) > () > > But it can't handle a form that contains an (evaluated) empty lazy > seq. Another example: > user=> (eval `(quote ~(range -1))) > CompilerException java.lang.UnsupportedOperationException: Unknown > Collection type, compiling:(NO_SOURCE_PATH:53) > > I think Alan pointed to bug. The empty-expr needs to check for LazySeq > instances as well. > > On Feb 14, 2:00 pm, Stuart Sierra <the.stuart.sie...@gmail.com> wrote: > > > > > > > > > A sequence is equal to a list because Clojure defines = to compare similar > > collections by their contents. For example, the vector [1 2 3] is equal (by > > the = function) to the list (1 2 3). > > > `eval` calls the Clojure compiler. The compiler operates on lists returned > > by the reader, so I would not expect it to work on lazy sequences. > > > -S -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
