syntax_data: {"ast_node_type":"other","tokens":[{"end":25,"kind":"keyword","start":0,"text":"}"}]}
source_snippet:                         }
context_before:                             Ty::new_mut_ref(tcx, tcx.lifetimes.re_erased, closure_ty)
context_after:                         ty::ClosureKind::FnOnce => closure_ty,