{"ast_node_type":"function","tokens":[{"end":84,"kind":"keyword","start":0,"text":"assert_matches(\"let"}]}
    assert_matches("let $a = $b;", "fn main() { let x = 10; x }", &["let x = 10;"]);
    assert_matches("let $a = 10;", "fn main() { let x = 10; x }", &["let x = 10;"]);
}