The Fn case works because print-dup is defined on fns:
user=> (binding [*print-dup* true] (println (fn [] nil)))
#=(user$eval2502$fn__2503. )
nil
user=> (read-string "#=(user$eval2502$fn__2503. )")
#<user$eval2502$fn__2503 user$eval2502$fn__2503@19037d90>
I still can't figure out why Compiler.emitValue is used though. Am I
right in thinking that clojure.core/eval is not calling the function
that the compiler uses, but instead serializing everything and pushing
it through the same pathway as compiling text files?
On 8 August 2013 16:43, Christophe Grand <christo...@cgrand.net> wrote:
> Right now I ca't figure why the fn case is working but the anonyous Var is
> failing because the vars are specially handled:
>
> else if(value instanceof Var)
> {
> Var var = (Var) value;
> gen.push(var.ns.name.toString());
> gen.push(var.sym.toString());
> gen.invokeStatic(RT_TYPE, Method.getMethod("clojure.lang.Var
> var(String,String)"));
> }
>
> Christophe
>
>
>
> On Thu, Aug 8, 2013 at 4:44 PM, Jamie Brandon <ja...@scattered-thoughts.net>
> wrote:
>>
>> What if it isn't inside a constant?
>>
>> user=> (eval `(fn [] ~#'x))
>> #<user$eval1366$fn__1367 user$eval1366$fn__1367@15dbb76>
>>
>> user=> (with-local-vars [x nil] (eval `(fn [] ~x)))
>> CompilerException java.lang.NullPointerException,
>> compiling:(NO_SOURCE_PATH:1:1)
>>
>> How about functions? These are unreadable but they still eval
>> correctly inside constants.
>>
>> user=> (letfn [(x [] nil)] (eval x))
>> #<user$eval1377$x__1378 user$eval1377$x__1378@5fea6729>
>>
>> user=> (letfn [(x [] nil)] (eval [x]))
>> [#<user$eval1381$x__1382 user$eval1381$x__1382@e3b7c27>]
>>
>> user=> (read-string "#<user$x user$x@1981e4d>")
>> RuntimeException Unreadable form clojure.lang.Util.runtimeException
>> (Util.java:219)
>>
>> user=> (defn x [] nil)
>> #'user/x
>>
>> user=> (eval x)
>> #<user$x user$x@14ff1714>
>>
>> user=> (eval [x])
>> [#<user$x user$x@5892d4a8>]
>>
>> user=> (read-string "#<user$eval1381$x__1382
>> user$eval1381$x__1382@e3b7c27>")
>> RuntimeException Unreadable form clojure.lang.Util.runtimeException
>> (Util.java:219)
>>
>> On 8 August 2013 14:58, Christophe Grand <christo...@cgrand.net> wrote:
>> > The error is caused by the fact that eval sees the var as a constant (or
>> > part of) and tries to serialize the constant.
>> > #<Var: --unnamed--> is unreadable while #'user/x is that explains teh
>> > difference in behaviour.
>> >
>> >
>> > On Thu, Aug 8, 2013 at 3:40 PM, Jamie Brandon
>> > <ja...@scattered-thoughts.net>
>> > wrote:
>> >>
>> >> This has me stumped:
>> >>
>> >> user=> (with-local-vars [x nil] (eval x))
>> >> #<Var: --unnamed-->
>> >> user=> (with-local-vars [x nil] (eval [x]))
>> >> CompilerException java.lang.NullPointerException,
>> >> compiling:(NO_SOURCE_PATH:1:1)
>> >>
>> >> By comparison:
>> >>
>> >> user=> (def x nil)
>> >> #'user/x
>> >> user=> (eval #'x)
>> >> #'user/x
>> >> user=> (eval [#'x])
>> >> [#'user/x]
>> >>
>> >> --
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>> >
>> >
>> >
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>
>
>
>
> --
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> Clojure Programming http://clojurebook.com
> Training, Consulting & Contracting http://lambdanext.eu/
>
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