In ClojureScript, using {{ns-unmap}} on a symbol from {{cljs.core}} doesn't exclude it from the current namespace. Note that both a function and a macro still exist, even after unmapping:
To quit, type: :cljs/quit
cljs.user=> (ns-unmap 'cljs.user 'when) ;; macro
true
cljs.user=> (ns-unmap 'cljs.user 'not) ;; function
true
cljs.user=> (when 1 2)
2
cljs.user=> (not false)
true
This differs from the behavior of Clojure's {{ns-unmap}}. Note the appropriate errors when attempting to use unmapped symbols:
Clojure 1.7.0-beta1
user=> (ns-unmap 'user 'when) ;; macro
nil
user=> (ns-unmap 'user 'not) ;; function
nil
user=> (when 1 2)
CompilerException java.lang.RuntimeException: Unable to resolve symbol: when in this context, compiling:(NO_SOURCE_PATH:11:1)
user=> (not false)
CompilerException java.lang.RuntimeException: Unable to resolve symbol: not in this context, compiling:(NO_SOURCE_PATH:12:1)
Somehow ClojureScript's {{ns-unmap}} needs to add the symbol to the current namespace's {{:excludes}} set. Note that the {{def}} special form does this already (after it displays a warning).
We have two solutions. 0001 extends the {{ns}} form's {{:merge}} behavior to support {{:excludes}}, and then uses this in {{ns-unmap}}. If the enhancement to {{ns}} isn't wanted, patch 0002 changes {{ns-unmap}} to update {{:excludes}} directly.
