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When an extension function is defined outside of any class, script evaluation is not resolving it
e.g.
   class X()
  operator fun X.plus(x:X) = 1

I cannot get + or plus to be resolved from within a script,  but when I put the method in the class like

class X () {
   operator fun plus( x: X) = 1
}

then      X() + X()  works although a fully qualified     X().packagename.plus( X()) cannot resolve  'plus'

Im guessing this has to do with how extension functions are named and imported  -- but I havent found the 'trick'  to import them.
Any suggestions ?

I just checked - it works for me.
I defined a `.kt` file with your first def of the `X` and `plus` (in a package `test1`) then placed a script along with something like:
```
mport test1.X
import test1.plus
val x = X() + X()
```
and `+` is properly resolved.

Is your scenario different?
PS. I’m using the latest eap of 1.3.50.

Im using 1.3.41 , and JSR232 basic script support.

Can you try it with the EAP of 1.3.50? <https://discuss.kotlinlang.org/t/kotlin-1-3-50-early-access-preview/13525>