syntax_data: {"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"ty::Binder::dummy(ty::OutlivesPredicate(a_region,"}]}
source_snippet:             ty::Binder::dummy(ty::OutlivesPredicate(a_region, b_region)),
context_before:             obligation.param_env,
context_after:         ));