syntax_data: {"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"fast_reject::simplify_type(self,"}]}
source_snippet:             fast_reject::simplify_type(self, self_ty, TreatParams::InstantiateWithInfer)
context_before:         if let Some(simp) =
context_after:         {