{"ast_node_type":"function","tokens":[{"end":63,"kind":"keyword","start":0,"text":"fn"}]}
fn f() { let a: u128 = 1; let b: u128 = unimplemented$0!() }"#,
            r#"//- minicore: todo, unimplemented
            r#"fn f() { let a: u128 = 1; let b: u128 = a }"#,