syntax_data: {"ast_node_type":"other","tokens":[{"end":58,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // being cast to `Foo + 'a` outlives `'a`:
context_before:                 // If the type is `Foo + 'a`, ensure that the type
context_after:                 let outlives = ty::OutlivesPredicate(source, r);