syntax_data: {"ast_node_type":"other","tokens":[{"end":26,"kind":"keyword","start":0,"text":"_"}]}
source_snippet:                     _ => {
context_before:                     ty::BoundRegionKind::Anon | ty::BoundRegionKind::ClosureEnv => r,
context_after:                         // Index doesn't matter, since this is just for naming and these never get bound