Backward compatibility problem with UAST

Encapsulation does not work in inline function, so such code is dangerous:

inline fun <reified T : UElement> PsiElement?.toUElementOfType(): T? =
  this?.let { UastFacade.convertElementWithParent(this, T::class.java) as T? } 

This code is from 192, and in 191 it was

inline fun <reified T : UElement> PsiElement?.toUElementOfType(): T? =
        this?.let { ServiceManager.getService(project, UastContext::class.java).convertElementWithParent(this, T::class.java) as T? }

So if I use the function, and compile the plugin with 192 api and run it with IDEA 2019.1, I get the ClassDefNotFound exception, as it does not have UastFacade.

You could write the function in such way:

inline fun <reified T : UElement> PsiElement?.toUElementOfType(): T? = toUElement(T::class.java)

and it would be safe, as `toUElement` encapsulates the behavior.