syntax_data: {"ast_node_type":"other","tokens":[{"end":23,"kind":"keyword","start":0,"text":"def_id,"}]}
source_snippet:                 def_id,
context_before:                 "associated_types_for_impl_traits_in_trait_or_impl: {:?} should be Trait or Impl but is {:?}",
context_after:                 tcx.def_kind(def_id)