Hi Simone,
The stack overflow here is caused by the REPL trying to print a circular
reference. `swap!` always returns the new value of the Atom, and the REPL
tries to print it.
If you don't print the Atom, this self-reference can still work:
user=> (def a (atom {}))
#'user/a
user=> (do (swap! a assoc :self a) nil)
nil
user=> (= a (:self @a))
true
–S
On Friday, August 7, 2015 at 9:42:05 AM UTC-4, Simone Mosciatti wrote:
>
> Hi all,
>
> I noticed this behaviour that I was not expecting:
>
> simo@simo:~$ lein repl
> nREPL server started on port 42010 on host 127.0.0.1 - nrepl://
> 127.0.0.1:42010
> REPL-y 0.3.5, nREPL 0.2.6
> Clojure 1.6.0
> OpenJDK 64-Bit Server VM 1.7.0_79-b14
> Docs: (doc function-name-here)
> (find-doc "part-of-name-here")
> Source: (source function-name-here)
> Javadoc: (javadoc java-object-or-class-here)
> Exit: Control+D or (exit) or (quit)
> Results: Stored in vars *1, *2, *3, an exception in *e
>
> user=> (def a (atom {}))
> #'user/a
> user=> (swap! a assoc :self a)
>
> StackOverflowError java.util.regex.Pattern$GroupHead.match
> (Pattern.java:4556)
> user=> (swap! a assoc :test :ok)
>
> StackOverflowError java.lang.Character.codePointAt (Character.java:4668)
> user=> a
>
> StackOverflowError java.util.regex.Pattern$Curly.match0
> (Pattern.java:4148)
> user=> (def b (atom {}))
> #'user/b
> user=> (swap! b assoc :test :ok)
> {:test :ok}
>
> It is something expected or I should open a bug report ?
>
> Greets
>
> Simone
>
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