syntax_data: {"ast_node_type":"other","tokens":[{"end":30,"kind":"keyword","start":0,"text":"TraitVPtr(TraitRef<'tcx>),"}]}
source_snippet:     TraitVPtr(TraitRef<'tcx>),
context_before:     /// pointer to a separate supertrait vtable, can be used by trait upcasting coercion
context_after: }