syntax_data: {"ast_node_type":"other","tokens":[{"end":9,"kind":"keyword","start":0,"text":"{"}]}
source_snippet:         {
context_before:         ) -> Answer<<TyCtxt<'tcx> as QueryContext>::Region, <TyCtxt<'tcx> as QueryContext>::Type>
context_after:             let Self { src, dst, assume, context } = self;