Clojurians Log v2
beginners
when defining a namespace, I can use (:require [some-namespace :refer [name1 name2 ...]) Is there a way to only list the names I DONT want to import instead?
Is it really not allowed to define a function by giving its fully qualified name?
(defn clojure-rte.api-test/-main []
(clojure.test/run-tests 'clojure-rte.api-test))2. Unhandled clojure.lang.Compiler$CompilerException
Error compiling test/clojure_rte/api_test.clj at (31:1)
{:clojure.error/phase :macro-syntax-check,
:clojure.error/line 31,
:clojure.error/column 1,
:clojure.error/source "/Users/jimka/Repos/clojure-rte/test/clojure_rte/api_test.clj",
:clojure.error/symbol clojure.core/defn}
Compiler.java: 6971 clojure.lang.Compiler/checkSpecs
Compiler.java: 6987 clojure.lang.Compiler/macroexpand1
Compiler.java: 7074 clojure.lang.Compiler/macroexpand
Compiler.java: 7160 clojure.lang.Compiler/eval
Compiler.java: 7131 clojure.lang.Compiler/eval
core.clj: 3214 clojure.core/eval
core.clj: 3210 clojure.core/eval
interruptible_eval.clj: 82 nrepl.middleware.interruptible-eval/evaluate/fn/fn
AFn.java: 152 clojure.lang.AFn/applyToHelper
AFn.java: 144 clojure.lang.AFn/applyTo
core.clj: 665 clojure.core/apply
core.clj: 1973 clojure.core/with-bindings*
core.clj: 1973 clojure.core/with-bindings*
RestFn.java: 425 clojure.lang.RestFn/invoke
interruptible_eval.clj: 82 nrepl.middleware.interruptible-eval/evaluate/fn
main.clj: 414 clojure.main/repl/read-eval-print/fn
main.clj: 414 clojure.main/repl/read-eval-print
main.clj: 435 clojure.main/repl/fn
main.clj: 435 clojure.main/repl
main.clj: 345 clojure.main/repl
RestFn.java: 137 clojure.lang.RestFn/applyTo
core.clj: 665 clojure.core/apply
core.clj: 660 clojure.core/apply
regrow.clj: 20 refactor-nrepl.ns.slam.hound.regrow/wrap-clojure-repl/fn
RestFn.java: 1523 clojure.lang.RestFn/invoke
interruptible_eval.clj: 79 nrepl.middleware.interruptible-eval/evaluate
interruptible_eval.clj: 56 nrepl.middleware.interruptible-eval/evaluate
interruptible_eval.clj: 145 nrepl.middleware.interruptible-eval/interruptible-eval/fn/fn
AFn.java: 22 clojure.lang.AFn/run
session.clj: 202 nrepl.middleware.session/session-exec/main-loop/fn
session.clj: 201 nrepl.middleware.session/session-exec/main-loop
AFn.java: 22 clojure.lang.AFn/run
Thread.java: 834 java.lang.Thread/run
1. Caused by clojure.lang.ExceptionInfo
Call to clojure.core/defn did not conform to spec.
{:clojure.spec.alpha/problems [{:path [:fn-name],
:pred clojure.core/simple-symbol?,
:val clojure-rte.api-test/-main,
:via [:clojure.core.specs.alpha/defn-args
:clojure.core.specs.alpha/defn-args],
:in [0]}],
:clojure.spec.alpha/spec #object[clojure.spec.alpha$regex_spec_impl$reify__2509
"0x1f2ac1cd"
"clojure.spec.alpha$regex_spec_impl$reify__2509@1f2ac1cd"],
:clojure.spec.alpha/value (clojure-rte.api-test/-main
[]
(clojure.test/run-tests
(quote clojure-rte.api-test))),
:clojure.spec.alpha/args (clojure-rte.api-test/-main
[]
(clojure.test/run-tests
(quote clojure-rte.api-test)))}
...stuff omitted...I guess this is the :exclude option ?
but apparently I must use :refer :all :exclude [...]
it would seem so: https://github.com/clojure/core.specs.alpha/blob/master/src/main/clojure/clojure/core/specs/alpha.clj#L86
I wonder what the reasoning for that is. coming from Common Lisp, this seems really bizarre.
perhaps it is to maintain the invariant that the reader remain side-effect free ?
However, what does the reader do when it encounters
(defn some-ns/fname [] ...)simple-symbol? on a symbol which is not simple. Did the parser actually create a symbol in the some-ns namespace?i don't know the answer to that question 🙂
my guess after looking at: * https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/LispReader.java#L305 * https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/LispReader.java#L408 * https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/LispReader.java#L416-L464 is that a symbol (fully-qualified, so with the namespace part) is created, but not in any particular namespace. it appears one can do this kind of thing:
user=> (symbol "hi/there")
hi/there
user=> (find-ns 'hi)
niluser=> (symbol "there")
there
user=> (type (symbol "there"))
clojure.lang.Symbol
user=> there
Syntax error compiling at (REPL:0:0).
Unable to resolve symbol: there in this contexti find many things in clojure to be not so easy to determine reasoning for. sometimes there seem to be answers if an appropriate party is consulted.
I think the intention is to discourage you from creating symbols in another namespace, to keep things modular. If there is a symbol already, you can set it from 'outside' with alter-var-root. Hopefully someone with more knowledge can provide more detail.
Hi folks. what can cause this? :
Exception in thread "async-dispatch-1" clojure.lang.ArityException: Wrong number of args (3) passed to: clojure.core.async.impl.ioc-macros/put!put! <! >! with 3 arity!I checked every async command in the code and no problem than i can find.
Found out! The guy used <! instead of >! this caused the error
:thumbsup:
you can use clojure.walk/macroexpand-all to see what code might be producing that problem
Thank you! but well its a huge project, How should i use it? @smith.adriane
where did all this code come from?
i was thinking you would have some narrowed down portion of the code that you could macroexpand, and examine all the put! calls
is this clojure or clojurescript?
and which version of core.async?
Did I get this right about datomic ions: When I deploy a web application, I can still modify the underlying system my main application runs on, because it's just an EC2 instance running linux under the hood?
I'm asking because i need libpython-cljto run some python scripts on the backend as well, so I need to have a python environment on wherever my code will run