syntax_data: {"ast_node_type":"variable","tokens":[{"end":43,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:                 if let Some(overlap_kind) =
context_before:             .map_or(Ok((false, false)), |overlap| {
context_after:                     tcx.impls_are_allowed_to_overlap(impl_def_id, possible_sibling)