syntax_data: {"ast_node_type":"variable","tokens":[{"end":27,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if let Some(simp) =
context_before:         let impls = self.trait_impls_of(trait_def_id);
context_after:             fast_reject::simplify_type(self, self_ty, TreatParams::InstantiateWithInfer)