syntax_data: {"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"|"}]}
source_snippet:             | ty::Alias(ty::Projection | ty::Opaque, ty::AliasTy { def_id, args, .. })
context_before:             ty::FnDef(def_id, args)
context_after:             | ty::Closure(def_id, args)