syntax_data: {"ast_node_type":"other","tokens":[{"end":48,"kind":"keyword","start":0,"text":"#[allow(rustc::potential_query_instability)]"}]}
source_snippet:     #[allow(rustc::potential_query_instability)]
context_before:     #[cfg_attr(feature = "nightly", rustc_lint_query_instability)]
context_after:     fn iter(&self) -> impl Iterator<Item = (X::Input, PathsToNested)> + '_ {