syntax_data: {"ast_node_type":"function","tokens":[{"end":74,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn add_wf_preds_for_alias_term(&mut self, data: ty::AliasTerm<'tcx>) {
context_before:     /// into `self.out`.
context_after:         // A projection is well-formed if