EinsumIterator.opIndex

Undocumented in source. Be warned that the author may not have intended to support it.
struct EinsumIterator(Iterator, SomeSlice, Node)
ref scope
opIndex
(
ptrdiff_t index
)
if (
is(SomeSlice == Slice!(T, Rank, kind),
T
ulong Rank
SliceKind kind
)
)

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