I'm using the 1.0.28 build of Fan. I can't seem to call the toDecimal() method on an instance declared as a type of Num:

Mass div(Num divisor) {
  return make(amount / divisor.toDecimal)
}

sys::Err: java.lang.NoSuchMethodError: fan.sys.Num.toDecimal()Lfan/sys/Decimal;
quantity::Mass.mult (Mass.fan:26)
TestMass_0::TestMass.main (/C:/dev/fan/quantity/TestMass.fan:17)
sun.reflect.NativeMethodAccessorImpl.invoke0 (Unknown)
sun.reflect.NativeMethodAccessorImpl.invoke (Unknown)
sun.reflect.DelegatingMethodAccessorImpl.invoke (Unknown)
java.lang.reflect.Method.invoke (Unknown)
fan.sys.Method.invoke (Method.java:513)
fan.sys.Method$MethodFunc.call (Method.java:216)
fan.sys.Method.call (Method.java:178)
fanx.tools.Fan.callMain (Fan.java:132)
fanx.tools.Fan.executeFile (Fan.java:85)
fanx.tools.Fan.execute (Fan.java:36)
fanx.tools.Fan.run (Fan.java:225)
fanx.tools.Fan$1.run (Fan.java:267)
fan.sys.Thread$Val.run (Thread.java:453)

Looking at Num.java, it doesn't seem to declare the method signature for toDecimal(), which I suspect is the problem.

thanks for the report

fixed for build 1.0.29