{"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"if"}]}
                    if len.ty(self.body, tcx) != tcx.types.usize {
                if let AssertKind::BoundsCheck { len, index } = &**msg {
                        span_mirbug!(self, len, "bounds-check length non-usize {:?}", len)