syntax_data: {"ast_node_type":"other","tokens":[{"end":32,"kind":"keyword","start":0,"text":"type"}]}
source_snippet:     type Output = StackEntry<X>;
context_before: impl<X: Cx> Index<StackDepth> for Stack<X> {
context_after:     fn index(&self, index: StackDepth) -> &StackEntry<X> {