syntax_data: {"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"self.add_wf_preds_for_pat_ty(base_ty,"}]}
source_snippet:                     self.add_wf_preds_for_pat_ty(base_ty, pat)
context_before:                 for pat in patterns {
context_after:                 }