[CLJ-869] Macro auto-gensym in let not visible after a nested unquote/syntax-quote

Fri, 2 Dec 2011 10:42:59 -0600

See the following simplified example:

user=> (defmacro foo [flag]
        `(let [a# 1]
          ~(if flag
             `(println a#))))
#'user/foo
user=> (foo false)
nil
user=> (foo true)
java.lang.Exception: Unable to resolve symbol: a__574__auto__ in this context (NO_SOURCE_FILE:6)
user=> (macroexpand-1 '(foo true))
(clojure.core/let [a__575__auto__ 1] (clojure.core/println a__574__auto__))

Clojure JIRA

[CLJ-869] Macro auto-gensym in let not visible after a nested unquote/syntax-quote