syntax_data: {"ast_node_type":"impl","tokens":[{"end":78,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: /// the `parent_impl_def_id` also applies (i.e. it has a valid impl header and
context_before: /// For every type that could apply to `specializing_impl_def_id`, we prove that
context_after: /// its where-clauses hold).