I didn't know that macros can do that! Thanks for the detailed answer. On Monday, August 5, 2013 8:00:16 PM UTC+9, Tassilo Horn wrote: > > Alice <doff...@gmail.com <javascript:>> writes: > > > (defmacro foo > > [c] > > `(<! ~c)) > > > > (let [c (chan)] > > (go (prn (foo c))) > > (>!! c :hi)) > > > > I thought this would not work because foo is expanded after go is > expanded, > > so <! isn't visible to go. > > What am I missing? > > `go` explicitly macroexpands the form given to it rather than relying on > the standard outside-in macroexpansion order. You can see that in the > clojure.core.async.impl.ioc-macros namespace, i.e., there's an `expand` > function called by the :list implementation of the -item-to-ssa > multimethod. > > Bye, > Tassilo >
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