syntax_data: {"ast_node_type":"other","tokens":[{"end":48,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // Use a pre-interned one when possible.
context_before:     ) -> Region<'tcx> {
context_after:         if let ty::BoundRegion { var, kind: ty::BoundRegionKind::Anon } = bound_region