syntax_data: {"ast_node_type":"other","tokens":[{"end":35,"kind":"keyword","start":0,"text":"for"}]}
source_snippet:         for arg in trait_ref.args {
context_before:     fn add_wf_preds_for_negative_trait_pred(&mut self, trait_ref: ty::TraitRef<'tcx>) {
context_after:             if let Some(term) = arg.as_term() {