# lein ringでエラーが発生した

- URL: <https://krymtkts.github.io/posts/2019-02-24-lein-ring-server-error.html.md>
- Date: 2019-02-24
- Author: krymtkts
- Tags: powershell

[前回](/posts/2019-02-20-instead-of-ping.md)以下のコメントを残した

> この記事をしたためておるときに`lein ring server`でエラーが出るようになってたのを解消したので、メモがてら次回に記す。

どのような状況だったかを以下に記すと

```powershell
lein ring server
clojure.lang.Compiler$CompilerException: Syntax error macroexpanding clojure.core/fn at (clojure/core/unify.clj:83:18).
#:clojure.error{:phase :macro-syntax-check, :line 83, :column 18, :source "clojure/core/unify.clj", :symbol clojure.core/fn}
 at clojure.lang.Compiler.checkSpecs (Compiler.java:6971)
    clojure.lang.Compiler.macroexpand1 (Compiler.java:6987)
    clojure.lang.Compiler.analyzeSeq (Compiler.java:7092)
    clojure.lang.Compiler.analyze (Compiler.java:6789)
    clojure.lang.Compiler.analyzeSeq (Compiler.java:7094)
    clojure.lang.Compiler.analyze (Compiler.java:6789)
    clojure.lang.Compiler.access$300 (Compiler.java:38)
    clojure.lang.Compiler$DefExpr$Parser.parse (Compiler.java:596)
    clojure.lang.Compiler.analyzeSeq (Compiler.java:7106)
    clojure.lang.Compiler.analyze (Compiler.java:6789)
    clojure.lang.Compiler.analyze (Compiler.java:6745)
    clojure.lang.Compiler.eval (Compiler.java:7180)
    clojure.lang.Compiler.load (Compiler.java:7635)
    clojure.lang.RT.loadResourceScript (RT.java:381)
    clojure.lang.RT.loadResourceScript (RT.java:372)
    clojure.lang.RT.load (RT.java:463)
    clojure.lang.RT.load (RT.java:428)
    clojure.core$load$fn__6824.invoke (core.clj:6126)
    clojure.core$load.invokeStatic (core.clj:6125)
    clojure.core$load.doInvoke (core.clj:6109)
    clojure.lang.RestFn.invoke (RestFn.java:408)
    clojure.core$load_one.invokeStatic (core.clj:5908)
    clojure.core$load_one.invoke (core.clj:5903)
    clojure.core$load_lib$fn__6765.invoke (core.clj:5948)
    clojure.core$load_lib.invokeStatic (core.clj:5947)
    clojure.core$load_lib.doInvoke (core.clj:5928)
    clojure.lang.RestFn.applyTo (RestFn.java:142)
    clojure.core$apply.invokeStatic (core.clj:667)
    clojure.core$load_libs.invokeStatic (core.clj:5985)
    clojure.core$load_libs.doInvoke (core.clj:5969)
    clojure.lang.RestFn.applyTo (RestFn.java:137)
    clojure.core$apply.invokeStatic (core.clj:667)
    clojure.core$require.invokeStatic (core.clj:6007)
    clojure.core$require.doInvoke (core.clj:6007)
    clojure.lang.RestFn.invoke (RestFn.java:421)
    clojure.core.contracts.impl.transformers$eval690$loading__6706__auto____691.invoke (transformers.clj:1)
    clojure.core.contracts.impl.transformers$eval690.invokeStatic (transformers.clj:1)
    clojure.core.contracts.impl.transformers$eval690.invoke (transformers.clj:1)
    clojure.lang.Compiler.eval (Compiler.java:7176)
    clojure.lang.Compiler.eval (Compiler.java:7165)
    clojure.lang.Compiler.load (Compiler.java:7635)
    clojure.lang.RT.loadResourceScript (RT.java:381)
    clojure.lang.RT.loadResourceScript (RT.java:372)
    clojure.lang.RT.load (RT.java:463)
    clojure.lang.RT.load (RT.java:428)
    clojure.core$load$fn__6824.invoke (core.clj:6126)
    clojure.core$load.invokeStatic (core.clj:6125)
    clojure.core$load.doInvoke (core.clj:6109)
    clojure.lang.RestFn.invoke (RestFn.java:408)
    clojure.core$load_one.invokeStatic (core.clj:5908)
    clojure.core$load_one.invoke (core.clj:5903)
    clojure.core$load_lib$fn__6765.invoke (core.clj:5948)
    clojure.core$load_lib.invokeStatic (core.clj:5947)
    clojure.core$load_lib.doInvoke (core.clj:5928)
    clojure.lang.RestFn.applyTo (RestFn.java:142)
    clojure.core$apply.invokeStatic (core.clj:667)
    clojure.core$load_libs.invokeStatic (core.clj:5985)
    clojure.core$load_libs.doInvoke (core.clj:5969)
    clojure.lang.RestFn.applyTo (RestFn.java:137)
    clojure.core$apply.invokeStatic (core.clj:667)
    clojure.core$require.invokeStatic (core.clj:6007)
    clojure.core$require.doInvoke (core.clj:6007)
    clojure.lang.RestFn.invoke (RestFn.java:408)
    leinjacker.defconstrainedfn$eval684$loading__6706__auto____685.invoke (defconstrainedfn.clj:1)
    leinjacker.defconstrainedfn$eval684.invokeStatic (defconstrainedfn.clj:1)
    leinjacker.defconstrainedfn$eval684.invoke (defconstrainedfn.clj:1)
    clojure.lang.Compiler.eval (Compiler.java:7176)
    clojure.lang.Compiler.eval (Compiler.java:7165)
    clojure.lang.Compiler.load (Compiler.java:7635)
    clojure.lang.RT.loadResourceScript (RT.java:381)
    clojure.lang.RT.loadResourceScript (RT.java:372)
    clojure.lang.RT.load (RT.java:463)
    clojure.lang.RT.load (RT.java:428)
    clojure.core$load$fn__6824.invoke (core.clj:6126)
    clojure.core$load.invokeStatic (core.clj:6125)
    clojure.core$load.doInvoke (core.clj:6109)
    clojure.lang.RestFn.invoke (RestFn.java:408)
    clojure.core$load_one.invokeStatic (core.clj:5908)
    clojure.core$load_one.invoke (core.clj:5903)
    clojure.core$load_lib$fn__6765.invoke (core.clj:5948)
    clojure.core$load_lib.invokeStatic (core.clj:5947)
    clojure.core$load_lib.doInvoke (core.clj:5928)
    clojure.lang.RestFn.applyTo (RestFn.java:142)
    clojure.core$apply.invokeStatic (core.clj:667)
    clojure.core$load_libs.invokeStatic (core.clj:5985)
    clojure.core$load_libs.doInvoke (core.clj:5969)
    clojure.lang.RestFn.applyTo (RestFn.java:137)
    clojure.core$apply.invokeStatic (core.clj:669)
    clojure.core$use.invokeStatic (core.clj:6093)
    clojure.core$use.doInvoke (core.clj:6093)
    clojure.lang.RestFn.invoke (RestFn.java:408)
    leinjacker.deps$eval676$loading__6706__auto____677.invoke (deps.clj:1)
    leinjacker.deps$eval676.invokeStatic (deps.clj:1)
    leinjacker.deps$eval676.invoke (deps.clj:1)
    clojure.lang.Compiler.eval (Compiler.java:7176)
    clojure.lang.Compiler.eval (Compiler.java:7165)
    clojure.lang.Compiler.load (Compiler.java:7635)
    clojure.lang.RT.loadResourceScript (RT.java:381)
    clojure.lang.RT.loadResourceScript (RT.java:372)
    clojure.lang.RT.load (RT.java:463)
    clojure.lang.RT.load (RT.java:428)
    clojure.core$load$fn__6824.invoke (core.clj:6126)
    clojure.core$load.invokeStatic (core.clj:6125)
    clojure.core$load.doInvoke (core.clj:6109)
    clojure.lang.RestFn.invoke (RestFn.java:408)
    clojure.core$load_one.invokeStatic (core.clj:5908)
    clojure.core$load_one.invoke (core.clj:5903)
    clojure.core$load_lib$fn__6765.invoke (core.clj:5948)
    clojure.core$load_lib.invokeStatic (core.clj:5947)
    clojure.core$load_lib.doInvoke (core.clj:5928)
    clojure.lang.RestFn.applyTo (RestFn.java:142)
    clojure.core$apply.invokeStatic (core.clj:667)
    clojure.core$load_libs.invokeStatic (core.clj:5985)
    clojure.core$load_libs.doInvoke (core.clj:5969)
    clojure.lang.RestFn.applyTo (RestFn.java:137)
    clojure.core$apply.invokeStatic (core.clj:667)
    clojure.core$require.invokeStatic (core.clj:6007)
    clojure.core$require.doInvoke (core.clj:6007)
    clojure.lang.RestFn.invoke (RestFn.java:436)
    leiningen.ring.server$eval668$loading__6706__auto____669.invoke (server.clj:1)
    leiningen.ring.server$eval668.invokeStatic (server.clj:1)
    leiningen.ring.server$eval668.invoke (server.clj:1)
    clojure.lang.Compiler.eval (Compiler.java:7176)
    clojure.lang.Compiler.eval (Compiler.java:7165)
    clojure.lang.Compiler.load (Compiler.java:7635)
    clojure.lang.RT.loadResourceScript (RT.java:381)
    clojure.lang.RT.loadResourceScript (RT.java:372)
    clojure.lang.RT.load (RT.java:463)
    clojure.lang.RT.load (RT.java:428)
    clojure.core$load$fn__6824.invoke (core.clj:6126)
    clojure.core$load.invokeStatic (core.clj:6125)
    clojure.core$load.doInvoke (core.clj:6109)
    clojure.lang.RestFn.invoke (RestFn.java:408)
    clojure.core$load_one.invokeStatic (core.clj:5908)
    clojure.core$load_one.invoke (core.clj:5903)
    clojure.core$load_lib$fn__6765.invoke (core.clj:5948)
    clojure.core$load_lib.invokeStatic (core.clj:5947)
    clojure.core$load_lib.doInvoke (core.clj:5928)
    clojure.lang.RestFn.applyTo (RestFn.java:142)
    clojure.core$apply.invokeStatic (core.clj:667)
    clojure.core$load_libs.invokeStatic (core.clj:5985)
    clojure.core$load_libs.doInvoke (core.clj:5969)
    clojure.lang.RestFn.applyTo (RestFn.java:137)
    clojure.core$apply.invokeStatic (core.clj:669)
    clojure.core$use.invokeStatic (core.clj:6093)
    clojure.core$use.doInvoke (core.clj:6093)
    clojure.lang.RestFn.invoke (RestFn.java:551)
    leiningen.ring$eval662$loading__6706__auto____663.invoke (ring.clj:1)
    leiningen.ring$eval662.invokeStatic (ring.clj:1)
    leiningen.ring$eval662.invoke (ring.clj:1)
    clojure.lang.Compiler.eval (Compiler.java:7176)
    clojure.lang.Compiler.eval (Compiler.java:7165)
    clojure.lang.Compiler.load (Compiler.java:7635)
    clojure.lang.RT.loadResourceScript (RT.java:381)
    clojure.lang.RT.loadResourceScript (RT.java:372)
    clojure.lang.RT.load (RT.java:463)
    clojure.lang.RT.load (RT.java:428)
    clojure.core$load$fn__6824.invoke (core.clj:6126)
    clojure.core$load.invokeStatic (core.clj:6125)
    clojure.core$load.doInvoke (core.clj:6109)
    clojure.lang.RestFn.invoke (RestFn.java:408)
    clojure.core$load_one.invokeStatic (core.clj:5908)
    clojure.core$load_one.invoke (core.clj:5903)
    clojure.core$load_lib$fn__6765.invoke (core.clj:5948)
    clojure.core$load_lib.invokeStatic (core.clj:5947)
    clojure.core$load_lib.doInvoke (core.clj:5928)
    clojure.lang.RestFn.applyTo (RestFn.java:142)
    clojure.core$apply.invokeStatic (core.clj:667)
    clojure.core$load_libs.invokeStatic (core.clj:5985)
    clojure.core$load_libs.doInvoke (core.clj:5969)
    clojure.lang.RestFn.applyTo (RestFn.java:137)
    clojure.core$apply.invokeStatic (core.clj:667)
    clojure.core$require.invokeStatic (core.clj:6007)
    clojure.core$require.doInvoke (core.clj:6007)
    clojure.lang.RestFn.invoke (RestFn.java:408)
    leiningen.core.utils$require_resolve.invokeStatic (utils.clj:102)
    leiningen.core.utils$require_resolve.invoke (utils.clj:95)
    leiningen.core.utils$require_resolve.invokeStatic (utils.clj:105)
    leiningen.core.utils$require_resolve.invoke (utils.clj:95)
    leiningen.core.main$lookup_task_var.invokeStatic (main.clj:69)
    leiningen.core.main$lookup_task_var.invoke (main.clj:65)
    leiningen.core.main$pass_through_help_QMARK_.invokeStatic (main.clj:79)
    leiningen.core.main$pass_through_help_QMARK_.invoke (main.clj:73)
    leiningen.core.main$task_args.invokeStatic (main.clj:82)
    leiningen.core.main$task_args.invoke (main.clj:81)
    leiningen.core.main$resolve_and_apply.invokeStatic (main.clj:339)
    leiningen.core.main$resolve_and_apply.invoke (main.clj:336)
    leiningen.core.main$_main$fn__6771.invoke (main.clj:449)
    leiningen.core.main$_main.invokeStatic (main.clj:439)
    leiningen.core.main$_main.doInvoke (main.clj:436)
    clojure.lang.RestFn.applyTo (RestFn.java:137)
    clojure.lang.Var.applyTo (Var.java:705)
    clojure.core$apply.invokeStatic (core.clj:665)
    clojure.main$main_opt.invokeStatic (main.clj:491)
    clojure.main$main_opt.invoke (main.clj:487)
    clojure.main$main.invokeStatic (main.clj:598)
    clojure.main$main.doInvoke (main.clj:561)
    clojure.lang.RestFn.applyTo (RestFn.java:137)
    clojure.lang.Var.applyTo (Var.java:705)
    clojure.main.main (main.java:37)
Caused by: clojure.lang.ExceptionInfo: Call to clojure.core/fn did not conform to spec.
#:clojure.spec.alpha{:problems ({:path [:fn-tail :arity-1 :params], :pred clojure.core/vector?, :val clojure.core.unify/var-unify, :via [:clojure.core.specs.alpha/params+body :clojure.core.specs.alpha/param-list :clojure.core.specs.alpha/param-list], :in [0]} {:path [:fn-tail :arity-n], :pred (clojure.core/fn [%] (clojure.core/or (clojure.core/nil? %) (clojure.core/sequential? %))), :val clojure.core.unify/var-unify, :via [:clojure.core.specs.alpha/params+body :clojure.core.specs.alpha/params+body], :in [0]}),
:spec #object[clojure.spec.alpha$regex_spec_impl$reify__2509 0x4f379769 "clojure.spec.alpha$regex_spec_impl$reify__2509@4f379769"], :value (clojure.core.unify/var-unify [G__800 G__801 G__802 G__803] (clojure.core/if-let [vb__793__auto__ (G__803 G__801)] (clojure.core.unify/garner-unifiers G__800 vb__793__auto__ G__802 G__803) (clojure.core/if-let [vexpr__794__auto__ (clojure.core/and (G__800 G__802) (G__803 G__802))] (clojure.core.unify/garner-unifiers G__800 G__801 vexpr__794__auto__ G__803) (if (clojure.core.unify/occurs? G__800 G__801 G__802 G__803) (throw (java.lang.IllegalStateException. (clojure.core/str "Cycle found in the path " G__802))) (clojure.core.unify/bind-phase G__803 G__801 G__802))))), :args (clojure.core.unify/var-unify [G__800 G__801 G__802 G__803] (clojure.core/if-let [vb__793__auto__ (G__803 G__801)] (clojure.core.unify/garner-unifiers G__800 vb__793__auto__ G__802 G__803) (clojure.core/if-let [vexpr__794__auto__ (clojure.core/and (G__800 G__802) (G__803 G__802))] (clojure.core.unify/garner-unifiers G__800 G__801 vexpr__794__auto__ G__803) (if (clojure.core.unify/occurs? G__800 G__801 G__802 G__803) (throw (java.lang.IllegalStateException. (clojure.core/str "Cycle found in the path " G__802))) (clojure.core.unify/bind-phase G__803 G__801 G__802)))))}
 at clojure.spec.alpha$macroexpand_check.invokeStatic (alpha.clj:705)
    clojure.spec.alpha$macroexpand_check.invoke (alpha.clj:697)
    clojure.lang.AFn.applyToHelper (AFn.java:156)
    clojure.lang.AFn.applyTo (AFn.java:144)
    clojure.lang.Var.applyTo (Var.java:705)
    clojure.lang.Compiler.checkSpecs (Compiler.java:6969)
    clojure.lang.Compiler.macroexpand1 (Compiler.java:6987)
    clojure.lang.Compiler.analyzeSeq (Compiler.java:7092)
    clojure.lang.Compiler.analyze (Compiler.java:6789)
    clojure.lang.Compiler.analyzeSeq (Compiler.java:7094)
    clojure.lang.Compiler.analyze (Compiler.java:6789)
    clojure.lang.Compiler.access$300 (Compiler.java:38)
    clojure.lang.Compiler$DefExpr$Parser.parse (Compiler.java:596)
    clojure.lang.Compiler.analyzeSeq (Compiler.java:7106)
    clojure.lang.Compiler.analyze (Compiler.java:6789)
    clojure.lang.Compiler.analyze (Compiler.java:6745)
    clojure.lang.Compiler.eval (Compiler.java:7180)
    clojure.lang.Compiler.load (Compiler.java:7635)
    clojure.lang.RT.loadResourceScript (RT.java:381)
    clojure.lang.RT.loadResourceScript (RT.java:372)
    clojure.lang.RT.load (RT.java:463)
    clojure.lang.RT.load (RT.java:428)
    clojure.core$load$fn__6824.invoke (core.clj:6126)
    clojure.core$load.invokeStatic (core.clj:6125)
    clojure.core$load.doInvoke (core.clj:6109)
    clojure.lang.RestFn.invoke (RestFn.java:408)
    clojure.core$load_one.invokeStatic (core.clj:5908)
    clojure.core$load_one.invoke (core.clj:5903)
    clojure.core$load_lib$fn__6765.invoke (core.clj:5948)
    clojure.core$load_lib.invokeStatic (core.clj:5947)
    clojure.core$load_lib.doInvoke (core.clj:5928)
    clojure.lang.RestFn.applyTo (RestFn.java:142)
    clojure.core$apply.invokeStatic (core.clj:667)
    clojure.core$load_libs.invokeStatic (core.clj:5985)
    clojure.core$load_libs.doInvoke (core.clj:5969)
    clojure.lang.RestFn.applyTo (RestFn.java:137)
    clojure.core$apply.invokeStatic (core.clj:667)
    clojure.core$require.invokeStatic (core.clj:6007)
    clojure.core$require.doInvoke (core.clj:6007)
    clojure.lang.RestFn.invoke (RestFn.java:421)
    clojure.core.contracts.impl.transformers$eval690$loading__6706__auto____691.invoke (transformers.clj:1)
    clojure.core.contracts.impl.transformers$eval690.invokeStatic (transformers.clj:1)
    clojure.core.contracts.impl.transformers$eval690.invoke (transformers.clj:1)
    clojure.lang.Compiler.eval (Compiler.java:7176)
    clojure.lang.Compiler.eval (Compiler.java:7165)
    clojure.lang.Compiler.load (Compiler.java:7635)
    clojure.lang.RT.loadResourceScript (RT.java:381)
    clojure.lang.RT.loadResourceScript (RT.java:372)
    clojure.lang.RT.load (RT.java:463)
    clojure.lang.RT.load (RT.java:428)
    clojure.core$load$fn__6824.invoke (core.clj:6126)
    clojure.core$load.invokeStatic (core.clj:6125)
    clojure.core$load.doInvoke (core.clj:6109)
    clojure.lang.RestFn.invoke (RestFn.java:408)
    clojure.core$load_one.invokeStatic (core.clj:5908)
    clojure.core$load_one.invoke (core.clj:5903)
    clojure.core$load_lib$fn__6765.invoke (core.clj:5948)
    clojure.core$load_lib.invokeStatic (core.clj:5947)
    clojure.core$load_lib.doInvoke (core.clj:5928)
    clojure.lang.RestFn.applyTo (RestFn.java:142)
    clojure.core$apply.invokeStatic (core.clj:667)
    clojure.core$load_libs.invokeStatic (core.clj:5985)
    clojure.core$load_libs.doInvoke (core.clj:5969)
    clojure.lang.RestFn.applyTo (RestFn.java:137)
    clojure.core$apply.invokeStatic (core.clj:667)
    clojure.core$require.invokeStatic (core.clj:6007)
    clojure.core$require.doInvoke (core.clj:6007)
    clojure.lang.RestFn.invoke (RestFn.java:408)
    leinjacker.defconstrainedfn$eval684$loading__6706__auto____685.invoke (defconstrainedfn.clj:1)
    leinjacker.defconstrainedfn$eval684.invokeStatic (defconstrainedfn.clj:1)
    leinjacker.defconstrainedfn$eval684.invoke (defconstrainedfn.clj:1)
    clojure.lang.Compiler.eval (Compiler.java:7176)
    clojure.lang.Compiler.eval (Compiler.java:7165)
    clojure.lang.Compiler.load (Compiler.java:7635)
    clojure.lang.RT.loadResourceScript (RT.java:381)
    clojure.lang.RT.loadResourceScript (RT.java:372)
    clojure.lang.RT.load (RT.java:463)
    clojure.lang.RT.load (RT.java:428)
    clojure.core$load$fn__6824.invoke (core.clj:6126)
    clojure.core$load.invokeStatic (core.clj:6125)
    clojure.core$load.doInvoke (core.clj:6109)
    clojure.lang.RestFn.invoke (RestFn.java:408)
    clojure.core$load_one.invokeStatic (core.clj:5908)
    clojure.core$load_one.invoke (core.clj:5903)
    clojure.core$load_lib$fn__6765.invoke (core.clj:5948)
    clojure.core$load_lib.invokeStatic (core.clj:5947)
    clojure.core$load_lib.doInvoke (core.clj:5928)
    clojure.lang.RestFn.applyTo (RestFn.java:142)
    clojure.core$apply.invokeStatic (core.clj:667)
    clojure.core$load_libs.invokeStatic (core.clj:5985)
    clojure.core$load_libs.doInvoke (core.clj:5969)
    clojure.lang.RestFn.applyTo (RestFn.java:137)
    clojure.core$apply.invokeStatic (core.clj:669)
    clojure.core$use.invokeStatic (core.clj:6093)
    clojure.core$use.doInvoke (core.clj:6093)
    clojure.lang.RestFn.invoke (RestFn.java:408)
    leinjacker.deps$eval676$loading__6706__auto____677.invoke (deps.clj:1)
    leinjacker.deps$eval676.invokeStatic (deps.clj:1)
    leinjacker.deps$eval676.invoke (deps.clj:1)
    clojure.lang.Compiler.eval (Compiler.java:7176)
    clojure.lang.Compiler.eval (Compiler.java:7165)
    clojure.lang.Compiler.load (Compiler.java:7635)
    clojure.lang.RT.loadResourceScript (RT.java:381)
    clojure.lang.RT.loadResourceScript (RT.java:372)
    clojure.lang.RT.load (RT.java:463)
    clojure.lang.RT.load (RT.java:428)
    clojure.core$load$fn__6824.invoke (core.clj:6126)
    clojure.core$load.invokeStatic (core.clj:6125)
    clojure.core$load.doInvoke (core.clj:6109)
    clojure.lang.RestFn.invoke (RestFn.java:408)
    clojure.core$load_one.invokeStatic (core.clj:5908)
    clojure.core$load_one.invoke (core.clj:5903)
    clojure.core$load_lib$fn__6765.invoke (core.clj:5948)
    clojure.core$load_lib.invokeStatic (core.clj:5947)
    clojure.core$load_lib.doInvoke (core.clj:5928)
    clojure.lang.RestFn.applyTo (RestFn.java:142)
    clojure.core$apply.invokeStatic (core.clj:667)
    clojure.core$load_libs.invokeStatic (core.clj:5985)
    clojure.core$load_libs.doInvoke (core.clj:5969)
    clojure.lang.RestFn.applyTo (RestFn.java:137)
    clojure.core$apply.invokeStatic (core.clj:667)
    clojure.core$require.invokeStatic (core.clj:6007)
    clojure.core$require.doInvoke (core.clj:6007)
    clojure.lang.RestFn.invoke (RestFn.java:436)
    leiningen.ring.server$eval668$loading__6706__auto____669.invoke (server.clj:1)
    leiningen.ring.server$eval668.invokeStatic (server.clj:1)
    leiningen.ring.server$eval668.invoke (server.clj:1)
    clojure.lang.Compiler.eval (Compiler.java:7176)
    clojure.lang.Compiler.eval (Compiler.java:7165)
    clojure.lang.Compiler.load (Compiler.java:7635)
    clojure.lang.RT.loadResourceScript (RT.java:381)
    clojure.lang.RT.loadResourceScript (RT.java:372)
    clojure.lang.RT.load (RT.java:463)
    clojure.lang.RT.load (RT.java:428)
    clojure.core$load$fn__6824.invoke (core.clj:6126)
    clojure.core$load.invokeStatic (core.clj:6125)
    clojure.core$load.doInvoke (core.clj:6109)
    clojure.lang.RestFn.invoke (RestFn.java:408)
    clojure.core$load_one.invokeStatic (core.clj:5908)
    clojure.core$load_one.invoke (core.clj:5903)
    clojure.core$load_lib$fn__6765.invoke (core.clj:5948)
    clojure.core$load_lib.invokeStatic (core.clj:5947)
    clojure.core$load_lib.doInvoke (core.clj:5928)
    clojure.lang.RestFn.applyTo (RestFn.java:142)
    clojure.core$apply.invokeStatic (core.clj:667)
    clojure.core$load_libs.invokeStatic (core.clj:5985)
    clojure.core$load_libs.doInvoke (core.clj:5969)
    clojure.lang.RestFn.applyTo (RestFn.java:137)
    clojure.core$apply.invokeStatic (core.clj:669)
    clojure.core$use.invokeStatic (core.clj:6093)
    clojure.core$use.doInvoke (core.clj:6093)
    clojure.lang.RestFn.invoke (RestFn.java:551)
    leiningen.ring$eval662$loading__6706__auto____663.invoke (ring.clj:1)
    leiningen.ring$eval662.invokeStatic (ring.clj:1)
    leiningen.ring$eval662.invoke (ring.clj:1)
    clojure.lang.Compiler.eval (Compiler.java:7176)
    clojure.lang.Compiler.eval (Compiler.java:7165)
    clojure.lang.Compiler.load (Compiler.java:7635)
    clojure.lang.RT.loadResourceScript (RT.java:381)
    clojure.lang.RT.loadResourceScript (RT.java:372)
    clojure.lang.RT.load (RT.java:463)
    clojure.lang.RT.load (RT.java:428)
    clojure.core$load$fn__6824.invoke (core.clj:6126)
    clojure.core$load.invokeStatic (core.clj:6125)
    clojure.core$load.doInvoke (core.clj:6109)
    clojure.lang.RestFn.invoke (RestFn.java:408)
    clojure.core$load_one.invokeStatic (core.clj:5908)
    clojure.core$load_one.invoke (core.clj:5903)
    clojure.core$load_lib$fn__6765.invoke (core.clj:5948)
    clojure.core$load_lib.invokeStatic (core.clj:5947)
    clojure.core$load_lib.doInvoke (core.clj:5928)
    clojure.lang.RestFn.applyTo (RestFn.java:142)
    clojure.core$apply.invokeStatic (core.clj:667)
    clojure.core$load_libs.invokeStatic (core.clj:5985)
    clojure.core$load_libs.doInvoke (core.clj:5969)
    clojure.lang.RestFn.applyTo (RestFn.java:137)
    clojure.core$apply.invokeStatic (core.clj:667)
    clojure.core$require.invokeStatic (core.clj:6007)
    clojure.core$require.doInvoke (core.clj:6007)
    clojure.lang.RestFn.invoke (RestFn.java:408)
    leiningen.core.utils$require_resolve.invokeStatic (utils.clj:102)
    leiningen.core.utils$require_resolve.invoke (utils.clj:95)
    leiningen.core.utils$require_resolve.invokeStatic (utils.clj:105)
    leiningen.core.utils$require_resolve.invoke (utils.clj:95)
    leiningen.core.main$lookup_task_var.invokeStatic (main.clj:69)
    leiningen.core.main$lookup_task_var.invoke (main.clj:65)
    leiningen.core.main$pass_through_help_QMARK_.invokeStatic (main.clj:79)
    leiningen.core.main$pass_through_help_QMARK_.invoke (main.clj:73)
    leiningen.core.main$task_args.invokeStatic (main.clj:82)
    leiningen.core.main$task_args.invoke (main.clj:81)
    leiningen.core.main$resolve_and_apply.invokeStatic (main.clj:339)
    leiningen.core.main$resolve_and_apply.invoke (main.clj:336)
    leiningen.core.main$_main$fn__6771.invoke (main.clj:449)
    leiningen.core.main$_main.invokeStatic (main.clj:439)
    leiningen.core.main$_main.doInvoke (main.clj:436)
    clojure.lang.RestFn.applyTo (RestFn.java:137)
    clojure.lang.Var.applyTo (Var.java:705)
    clojure.core$apply.invokeStatic (core.clj:665)
    clojure.main$main_opt.invokeStatic (main.clj:491)
    clojure.main$main_opt.invoke (main.clj:487)
    clojure.main$main.invokeStatic (main.clj:598)
    clojure.main$main.doInvoke (main.clj:561)
    clojure.lang.RestFn.applyTo (RestFn.java:137)
    clojure.lang.Var.applyTo (Var.java:705)
    clojure.main.main (main.java:37)
```

`lein ring server`がエラーを吐くようになった。

`lein help`で見てみてもringだけエラーが出てる

```powershell
lein help
Leiningen is a tool for working with Clojure projects.

Several tasks are available:
change              Rewrite project.clj with f applied to the value at key-or-path.
check               Check syntax and warn on reflection.
classpath           Write the classpath of the current project to output-file.
clean               Removes all files from paths in clean-targets for a project
compile             Compile Clojure source into .class files.
deploy              Deploy jar and pom to remote repository.
deps                Show details about dependencies.
do                  Higher-order task to perform other tasks in succession.
help                Display a list of tasks or help for a given task or subtask.
install             Install jar and pom to the local repository; typically ~/.m2.
jar                 Package up all the project's files into a jar file.
javac               Compile Java source files.
new                 Generate scaffolding for a new project based on a template.
plugin              DEPRECATED. Please use the :user profile instead.
pom                 Write a pom.xml file to disk for Maven interoperability.
release             Perform release tasks.
repl                Start a repl session either with the current project or standalone.
retest              Run only the test namespaces which failed last time around.
leiningen.ring  Problem loading: Syntax error macroexpanding clojure.core/fn at (clojure/core/unify.clj:83:18).
run                 Run the project's -main function.
search              Search Central and Clojars for published artifacts.
show-profiles       List all available profiles or display one if given an argument.
test                Run the project's tests.
trampoline          Run a task without nesting the project's JVM inside Leiningen's.
uberjar             Package up the project files and all dependencies into a jar file.
update-in           Perform arbitrary transformations on your project map.
upgrade             Upgrade Leiningen to specified version or latest stable.
vcs                 Interact with the version control system.
version             Print version for Leiningen and the current JVM.
with-profile        Apply the given task with the profile(s) specified.

Run `lein help $TASK` for details.

Global Options:
  -o             Run a task offline.
  -U             Run a task after forcing update of snapshots.
  -h, --help     Print this help or help for a specific task.
  -v, --version  Print Leiningen's version.

These aliases are available:
downgrade, expands to upgrade

See also: readme, faq, tutorial, news, sample, profiles, deploying, gpg,
mixed-source, templates, and copying.
```

この前後にPCのソフトウェア更新など諸々してたしJDK更新したからか？と云う気もしたが原因はわからず。

ブログを作るだけなら`lein run`すりゃいいだけなのでなくてもよいのだが、見れたほうが良いので他のversionだとどうか試してみたところ、
0.12.5以上でならイケることがわかったので、cryogenの`project.clj`に記述されてる`lein-ring`のversionを上げることで障害を解消した。

ブログを書くための見えない部分の障害なので最も楽な解決方法でいったが、プロダクトでこれが起こってたらもっとエラーの原因を深掘りしたであろうな🤔