syntax_data: {"ast_node_type":"other","tokens":[{"end":41,"kind":"keyword","start":0,"text":"ty::Coroutine(..)"}]}
source_snippet:                         ty::Coroutine(..)
context_before:                         ty::FnDef(..) | ty::FnPtr(..) => (),
context_after:                         | ty::CoroutineWitness(..)