Function builtin_vignette_engine 

fn builtin_vignette_engine(
    _args: &[RValue],
    named: &[(String, RValue)],
) -> Result<RValue, RError>

No-op in miniR — vignette processing is not supported. When called with package= to query registered engines, returns an empty list so callers can iterate without error.

@param name engine name (or missing to register) @param … ignored @return empty list (query mode) or NULL (registration mode) @namespace tools