syntax_data: {"ast_node_type":"other","tokens":[{"end":35,"kind":"keyword","start":0,"text":"infcx:"}]}
source_snippet:         infcx: &'a InferCtxt<'tcx>,
context_before:     pub fn replace_placeholders<T: TypeFoldable<TyCtxt<'tcx>>>(
context_after:         mapped_regions: FxIndexMap<ty::PlaceholderRegion, ty::BoundRegion>,