{"ast_node_type":"function","tokens":[{"end":61,"kind":"keyword","start":0,"text":"assert_matches(\"1"}]}
    assert_matches("1 + 2", "fn f() -> i32 {1+2}", &["1+2"]);
    assert_matches("1+2", "fn f() -> i32 {1  +  2}", &["1  +  2"]);
}