syntax_data: {"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":"self.print_expr(*expr,"}]}
source_snippet:                 self.print_expr(*expr, depth_lvl + 2);
context_before:                 print_indented!(self, "expr:", depth_lvl + 1);
context_after:                 print_indented!(self, format!("span: {:?}", span), depth_lvl + 1);