syntax_data: {"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // given that it is a *negative* trait predicate.
context_before:     // Compute the obligations that are required for `trait_ref` to be WF,
context_after:     fn add_wf_preds_for_negative_trait_pred(&mut self, trait_ref: ty::TraitRef<'tcx>) {