{"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"ExprKind::If(head_expression,"}]}
                ExprKind::If(head_expression, if_block, optional_else) =>
                    visit_visitable!($($mut)? vis, pat, expr, span),
                    visit_visitable!($($mut)? vis, head_expression, if_block, optional_else),