7626 private struct Slides(Flag!"withFewerElements" withFewerElements = Yes.withFewerElements, Source)  struct
7631     size_t _windowSize;
7632     size_t _stepSize;
7636         enum needsEndTracker = false;
7641         Source _nextSource;
7642         enum needsEndTracker = true;
7645     bool _empty;
7649         enum hasSliceToEnd = hasSlicing!Source && is(typeof(Source.init[0 .. $]) == Source);
7654     this(Source source, size_t windowSize, size_t stepSize)  in this()
7701     @property auto front()  in front()
7716     void popFront()  in popFront()
7740         @property bool empty() const  in empty()
7748         enum empty = false;
7752     @property typeof(this) save()  in save()
7760         @property size_t length()  in length()
7782         auto opIndex(size_t index)  in opIndex()
7805             typeof(this) opSlice(size_t lower, size_t upper)  in opSlice()
7836             auto opSlice(size_t lower, size_t upper)  in opSlice()
7848                 private static struct DollarToken{}
7849                 DollarToken opDollar()  in opDollar()
7854                 typeof(this) opSlice(size_t lower, DollarToken)  in opSlice()
7865             private static struct DollarToken
7871             DollarToken opDollar()  in opDollar()
7877             typeof(this) opSlice(DollarToken, DollarToken)  in opSlice()
7891             typeof(this) opSlice(size_t lower, DollarToken)  in opSlice()
7908             typeof(this) opSlice(DollarToken, size_t upper)  in opSlice()
7922             @property auto back()  in back()
7979             void popBack()  in popBack()