{"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":"err.subdiagnostic(errors::AddReturnTypeSuggestion::MissingHere"}]}
                    err.subdiagnostic(errors::AddReturnTypeSuggestion::MissingHere { span });
                    // FIXME: if `found` could be `impl Iterator` we should suggest that.
                }