syntax_data: {"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"(CheckRegions::OnlyParam"}]}
source_snippet:                     (CheckRegions::OnlyParam | CheckRegions::FromFunction, ty::ReEarlyParam(p)) => {
context_before:                     }
context_after:                         if !seen.insert(p.index) {