{"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"//"}]}
                    // It's an array; determine its length.
                    && let ty::Array(_, len) = place_base.ty(self.body, self.tcx).ty.kind()
                    && let Some(len) = len.try_to_target_usize(self.tcx)