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pre_eval_missing

r::interpreter::builtins::pre_eval

Function pre_eval_missing 

Source 
fn pre_eval_missing(
    args: &[Arg],
    _env: &Environment,
    context: &BuiltinContext<'_>,
) -> Result<RValue, RError>
Expand description

Test whether a formal argument was supplied in the current function call.

@param x unquoted name of a formal argument @return TRUE if the argument was not supplied, FALSE otherwise