syntax_data: {"ast_node_type":"function","tokens":[{"end":96,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn try_fold_with<F: FallibleTypeFolder<I>>(self, folder: &mut F) -> Result<Self, F::Error> {
context_before: impl<I: Interner, T: TypeFoldable<I>> TypeFoldable<I> for ThinVec<T> {
context_after:         self.into_iter().map(|t| t.try_fold_with(folder)).collect()