The R version the syntax of ast needs at least, undefined if every R reads it: the native pipe |>, the
lambda shorthand \(x) and raw strings r"(...)" need R 4.1, the placeholder _ (x |> f(y = _)) R 4.2,
and the placeholder at the head of an extraction (x |> _$a) R 4.3.
The R version the syntax of
astneeds at least,undefinedif every R reads it: the native pipe|>, the lambda shorthand\(x)and raw stringsr"(...)"need R 4.1, the placeholder_(x |> f(y = _)) R 4.2, and the placeholder at the head of an extraction (x |> _$a) R 4.3.