syntax_data: {"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"ExprKind::Adt(box"}]}
source_snippet:                 ExprKind::Adt(box AdtExpr { adt_def, variant_index, .. }) if {
context_before:             $(
context_after:                     $self.tcx.is_diagnostic_item(rustc_span::sym::$adt, adt_def.did()) &&