syntax_data: {"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // regions. This is perhaps not ideal.
context_before:                 // Here, we defer WF checking due to higher-ranked
context_after:                 self.add_wf_preds_for_dyn_ty(t, data, r);