syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"impl<'tcx>"}]}
source_snippet: impl<'tcx> Visitor<'tcx> for ConstMutationChecker<'_, 'tcx> {
context_after:     fn visit_statement(&mut self, stmt: &Statement<'tcx>, loc: Location) {