When executing `macro expand1()` with the compiler unresolvable symbols aren't an issue, except if they are fully qualified and their corresponding namespace does not exist, in which case a ClassNotFoundException is thrown. I find this to be inconsistent behaviour, since unresolvable symbols themselves do not cause such an exception.
My concrete use case here (to justify this change) is that I currently work on an Embedded Domain Specific Language (EDSL) in Clojure, where we adopt the namespace and interned symbols idea. However we want to avoid polluting the clojure namespaces themselves with our symbols which are only usable in our EDSL. Our EDSL is invoked with a macro call and the code inside this macro is completely interpreted by out own compiler. However we want to reuse some of the Clojure internal macros, such as `let` and `cond`, we therefore run a macro expand over the code before we start interpreting it. Since our import system doesn't actually produce a clojure namespace the macro expand call crashes on us if there are fully qualified symbols in the EDSL code. I'd like to avoid having to create an empty namespace each time we do a require in our EDSL and therefore propose to add a catch for the class loading exception in `macroexpand()`. *Note: our compiler is able to handle fully qualified symbols and aliasing without using clojures resolving* Example: This code is valid: (ns my-ns (:require [com.ohua.lang :refer [ohua]])) ; This macro brings com.ohua.lang.tests into our internal scope (for ohua), but does not create a namespace (ohua-require [com.ohua.lang.tests :refer [add]]) ; this macro enters our EDSL (ohua (add 3 4)) But this code fails in macroexpand1 (ns my-ns (:require [com.ohua.lang :refer [ohua]])) ; This macro brings com.ohua.lang.tests into our internal scope (for ohua), but does not create a namespace (ohua-require [com.ohua.lang.tests :refer [add]]) ; this macro enters our EDSL (ohua (com.ohua.lang.tests/add 3 4)) -- 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 --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
