syntax_data: {"ast_node_type":"function","tokens":[{"end":76,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn iter(&self) -> impl Iterator<Item = (X::Input, PathsToNested)> + '_ {
context_before:     #[allow(rustc::potential_query_instability)]
context_after:         self.nested_goals.iter().map(|(i, p)| (*i, *p))