syntax_data: {"ast_node_type":"other","tokens":[{"end":18,"kind":"keyword","start":0,"text":"&mut"}]}
source_snippet:         &mut self,
context_before:     fn wrap_binder<T, F: FnOnce(&T, &mut Self) -> Result<(), fmt::Error>>(
context_after:         value: &ty::Binder<'tcx, T>,