syntax_data: {"ast_node_type":"impl","tokens":[{"end":83,"kind":"keyword","start":0,"text":"assumptions:"}]}
source_snippet:     assumptions: impl IntoIterator<Item = ty::OutlivesPredicate<I, I::GenericArg>>,
context_before:     cx: I,
context_after: ) -> HashSet<ty::OutlivesPredicate<I, I::GenericArg>> {