syntax_data: {"ast_node_type":"function","tokens":[{"end":94,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn instantiate_supertrait(self, cx: I, trait_ref: ty::Binder<I, ty::TraitRef<I>>) -> Self;
context_before:     /// instantiation in terms of what happens with bound regions.
context_after: }