syntax_data: {"ast_node_type":"function","tokens":[{"end":69,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn check_tail_call(&mut self, call: &Expr<'_>, expr: &Expr<'_>) {
context_before: impl<'tcx> TailCallCkVisitor<'_, 'tcx> {
context_after:         if self.is_closure {