{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"trace!(\"Unsizing"}]}
        trace!("Unsizing {:?} of type {} into {}", *src, src.layout.ty, cast_ty.ty);
    ) -> InterpResult<'tcx> {
        match (src.layout.ty.kind(), cast_ty.ty.kind()) {