{"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"assist_expressionFillDefault:"}]}
        assist_expressionFillDefault: ExprFillDefaultDef              = ExprFillDefaultDef::Todo,
        /// Placeholder expression to use for missing expressions in assists.
        /// When inserting a type (e.g. in "fill match arms" assist), prefer to use `Self` over the type name where possible.