removes semi-dummy implementations of some of the semantic APIs
removes semi-dummy implementations of some of the semantic APIs

scalameta/scalameta,xeno-by/scalameta,MasseGuillaume/scalameta,scalameta/scalameta,scalameta/scalameta,xeno-by/scalameta,olafurpg/scalameta,olafurpg/scalameta,MasseGuillaume/scalameta,scalameta/scalameta,DavidDudson/scalameta,xeno-by/scalameta,scalameta/scalameta,DavidDudson/scalameta,olafurpg/scalameta,MasseGuillaume/scalameta,Dveim/scalameta