I was surprised that static methods can be inherited,except primitive type.

fansh> Int.echo("Ad")
java.lang.VerifyError: (class: fan/sh1/FanshEval, method: _eval signature: ()Lja
va/lang/Object;) Unable to pop operand off an empty stack
        at java.lang.Class.getDeclaredFields0(Native Method)
        at java.lang.Class.privateGetDeclaredFields(Unknown Source)
        at java.lang.Class.getDeclaredFields(Unknown Source)
        at fan.sys.ClassType.finishSlots(ClassType.java:562)
        at fan.sys.ClassType.finish(ClassType.java:525)
        at fan.sys.Method$MethodFunc.isStatic(Method.java:459)
        at fan.sys.Method$MethodFunc.callList(Method.java:175)
        at fan.sys.Type.make(Type.java:245)
        at fan.sys.ClassType.make(ClassType.java:110)
        at fan.fansh.Evaluator.eval(Evaluator.fan:111)
        at fan.fansh.Shell.run(Shell.fan:46)
        at fan.fansh.Main.main(Shell.fan:202)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at fan.sys.Method.invoke(Method.java:536)
        at fan.sys.Method$MethodFunc.callList(Method.java:182)
        at fan.sys.Method.callList(Method.java:147)
        at fanx.tools.Fan.callMain(Fan.java:135)
        at fanx.tools.Fan.executeType(Fan.java:102)
        at fanx.tools.Fan.execute(Fan.java:38)
        at fanx.tools.Fan.run(Fan.java:236)
        at fanx.tools.Fan.main(Fan.java:274)
sys::Err: Method not mapped to java.lang.reflect correctly sh1::FanshEval.make
  fan.sys.Method$MethodFunc.isStatic (Method.java:466)
  fan.sys.Method$MethodFunc.callList (Method.java:175)
  fan.sys.Type.make (Type.java:245)
  fan.sys.ClassType.make (ClassType.java:110)
  fansh::Evaluator.eval (Evaluator.fan:111)
  fansh::Shell.run (Shell.fan:46)
  fansh::Main.main (Shell.fan:202)
  java.lang.reflect.Method.invoke (Unknown)
  fan.sys.Method.invoke (Method.java:536)
  fan.sys.Method$MethodFunc.callList (Method.java:182)
  fan.sys.Method.callList (Method.java:147)
  fanx.tools.Fan.callMain (Fan.java:135)
  fanx.tools.Fan.executeType (Fan.java:102)
  fanx.tools.Fan.execute (Fan.java:38)
  fanx.tools.Fan.run (Fan.java:236)
  fanx.tools.Fan.main (Fan.java:274)

I think,if static method can't be override,inherited is no help.

That was sort of a weird boundary condition with the compiler's logic to do boxing of value-types.

I pushed a fix: changeset

Have you considered that to do static method as virtual and to override it in subclass