syntax_data: {"ast_node_type":"other","tokens":[{"end":103,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                     // We return a completely different ExprKind here to account for this special case.
context_before:                     // A unit struct/variant which is used as a value.
context_after:                     ty::Adt(adt_def, args) => ExprKind::Adt(Box::new(AdtExpr {