{"ast_node_type":"function","tokens":[{"end":55,"kind":"keyword","start":0,"text":"\"fn"}]}
        "fn foo() {} fn bar() {} fn f1() {foo(5, 42)}",
        "foo($a, $b) ==>> bar($b, $a)",
        expect![["fn foo() {} fn bar() {} fn f1() {bar(42, 5)}"]],