{"ast_node_type":"function","tokens":[{"end":60,"kind":"keyword","start":0,"text":"fn"}]}
    fn bitor_assign(&mut self, rhs: SemanticTokenModifier) {
impl ops::BitOrAssign<SemanticTokenModifier> for ModifierSet {
        let idx = SUPPORTED_MODIFIERS.iter().position(|it| it == &rhs).unwrap();