Function builtin_as_pairlist 

fn builtin_as_pairlist(
    args: &[RValue],
    _: &[(String, RValue)],
) -> Result<RValue, RError>

Convert a list to a pairlist. In miniR, pairlists are represented as lists.

@param x a list or other object @return a pairlist (represented as a list in miniR) @namespace base