syntax_data: {"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // `x..=y` where `x == y` and `x` and `y` are finite.
context_before:             (RangeEnd::Included, Some(Ordering::Less)) => {}
context_after:             (RangeEnd::Included, Some(Ordering::Equal)) if lo.is_finite() && hi.is_finite() => {