When nashorn script engine is used with jsr-223 API, script objects are wrapped as ScriptObjectMirror objects. "jrunscript" tool prints toString value of such objects - which results in really uninformative responses like below:

nashorn> x = new TypeError("asd")
jdk.nashorn.api.scripting.ScriptObjectMirror@9e493eb
nashorn> print
jdk.nashorn.api.scripting.ScriptObjectMirror@4c889b3c
nashorn> function func() { print("hello") }
jdk.nashorn.api.scripting.ScriptObjectMirror@f32b694

It'd be better if ScriptObjectMirror.toString is implemented to return better descriptive strings.