syntax_data: {"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"Tree::Ref(r)"}]}
source_snippet:             Tree::Ref(r) => Self::from_ref(r),
context_before:             Tree::Byte(b) => Self::from_byte(b),
context_after:             Tree::Alt(alts) => {