syntax_data: {"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":".opportunistic_resolve_var(self.infcx.tcx,"}]}
source_snippet:                 .opportunistic_resolve_var(self.infcx.tcx, vid),
context_before:                 .unwrap_region_constraints()
context_after:             _ => r0,