{"ast_node_type":"function","tokens":[{"end":67,"kind":"keyword","start":0,"text":"assert_matches(\"1+2\","}]}
    assert_matches("1+2", "fn f() -> i32 {1  +  2}", &["1  +  2"]);
fn ignores_whitespace() {
    assert_matches("1 + 2", "fn f() -> i32 {1+2}", &["1+2"]);