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[Kawa][Scheme] Kawaでの例外のキャッチ

(try-catch (display "test" "test")
    (ex 
      ((org.apache.logging.log4j.LogManager:getLogger):error ex ex)))

2015-12-15 11:54:05.165 ERROR [Thread-3] atInteractiveLevel$165.run(stdin:11) Argument #3 'test' to 'gnu.kawa.functions.DisplayFormat.format(java.lang.Object,gnu.lists.Consumer)' has wrong type (String) (java.lang.String cannot be cast to gnu.lists.Consumer)
gnu.mapping.WrongType: Argument #3 'test' to 'gnu.kawa.functions.DisplayFormat.format(java.lang.Object,gnu.lists.Consumer)' has wrong type (String) (java.lang.String cannot be cast to gnu.lists.Consumer)
        at kawa.lib.ports.display(ports.scm:315) ~[kawa-2.0.jar:?]
        at atInteractiveLevel$165.run(stdin:9) [?:?]
        at gnu.expr.ModuleExp.evalModule2(ModuleExp.java:317) [kawa-2.0.jar:?]
        at gnu.expr.ModuleExp.evalModule(ModuleExp.java:219) [kawa-2.0.jar:?]
        at kawa.Shell.run(Shell.java:291) [kawa-2.0.jar:?]
        at kawa.Shell.run(Shell.java:203) [kawa-2.0.jar:?]
        at kawa.Shell.run(Shell.java:184) [kawa-2.0.jar:?]
        at kawa.ReplDocument$2.apply0(ReplDocument.java:98) [kawa-2.0.jar:?]
        at gnu.mapping.RunnableClosure.run(RunnableClosure.java:80) [kawa-2.0.jar:?]
        at gnu.mapping.Future.run(Future.java:46) [kawa-2.0.jar:?]
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to gnu.lists.Consumer
        at kawa.lib.ports.display(ports.scm:314) ~[kawa-2.0.jar:?]
        ... 9 more