syntax_data: {"ast_node_type":"other","tokens":[{"end":39,"kind":"keyword","start":0,"text":"Ok((from,"}]}
source_snippet:             Ok((from, to, parent)) => {
context_before:         match Span::prepare_to_combine(self, end) {
context_after:                 Span::new(cmp::min(from.lo, to.lo), cmp::max(from.lo, to.lo), from.ctxt, parent)