Function builtin_complete_cases 

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

Return a logical vector indicating which “rows” have no NA values.

For vectors, returns TRUE for each non-NA element. For multiple arguments (conceptually columns of a data frame), returns TRUE for positions where all arguments are non-NA.

@param … one or more vectors @return logical vector