syntax_data: {"ast_node_type":"other","tokens":[{"end":5,"kind":"keyword","start":0,"text":"where"}]}
source_snippet: where
context_before: impl<I: Interner, Iter: IntoIterator, A> DoubleEndedIterator for IterInstantiated<I, Iter, A>
context_after:     Iter::IntoIter: DoubleEndedIterator,