syntax_data: {"ast_node_type":"other","tokens":[{"end":31,"kind":"keyword","start":0,"text":"infcx:"}]}
source_snippet:     infcx: &'a InferCtxt<'tcx>,
context_before: pub struct PlaceholderReplacer<'a, 'tcx> {
context_after:     mapped_regions: FxIndexMap<ty::PlaceholderRegion, ty::BoundRegion>,