syntax_data: {"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"tcx.dcx().create_err(UnsizedPattern"}]}
source_snippet:                             tcx.dcx().create_err(UnsizedPattern { span, non_sm_ty: *pointee_ty }),
context_before:                         return self.mk_err(
context_after:                             ty,