syntax_data: {"ast_node_type":"variable","tokens":[{"end":25,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if let Some(st) =
context_before:         let vec: &mut Vec<DefId>;
context_after:             fast_reject::simplify_type(tcx, trait_ref.self_ty(), TreatParams::InstantiateWithInfer)