syntax_data: {"ast_node_type":"function","tokens":[{"end":58,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn filter_to_traits(self) -> FilterToTraits<I, Self> {
context_before: impl<I: Interner> Elaborator<I, I::Clause> {
context_after:         FilterToTraits { _cx: PhantomData, base_iterator: self }