syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if self.tcx.def_kind(owner_def) != DefKind::Closure {
context_before:     fn closure_env_param(&self, owner_def: LocalDefId, expr_id: HirId) -> Option<Param<'tcx>> {
context_after:             return None;