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nth_back wasn't stablilized until 1.37 #85

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Feb 10, 2020
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nth_back wasn't stablilized until 1.37 #85

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6 changes: 1 addition & 5 deletions strum_macros/src/macros/enum_iter.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -120,11 +120,7 @@ pub fn enum_iter_inner(ast: &syn::DeriveInput) -> TokenStream {

impl #impl_generics DoubleEndedIterator for #iter_name #ty_generics #where_clause {
fn next_back(&mut self) -> Option<Self::Item> {
self.nth_back(0)
}

fn nth_back(&mut self, n: usize) -> Option<Self::Item> {
let back_idx = self.back_idx + n + 1;
let back_idx = self.back_idx + 1;

if self.idx + back_idx > #variant_count {
// We went past the end of the iterator. Freeze back_idx at #variant_count
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