syntax_data: {"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"$self.tcx.is_diagnostic_item(rustc_span::sym::$name,"}]}
source_snippet:                             $self.tcx.is_diagnostic_item(rustc_span::sym::$name, *did)
context_before:                         ty::FnDef(did, _) => {
context_after:                         }