syntax_data: {"ast_node_type":"other","tokens":[{"end":11,"kind":"keyword","start":0,"text":")?,"}]}
source_snippet:         )?,
context_before:             GenericConstantTooComplexSub::AddressAndDerefNotSupported(node.span),
context_after:         ExprKind::Repeat { .. } | ExprKind::Array { .. } => {