syntax_data: {"ast_node_type":"other","tokens":[{"end":22,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// reference `x`.
context_before:     /// y: &'a u32)` and we want to give a name to the region of the
context_after:     highlight_bound_region: Option<(ty::BoundRegionKind, usize)>,