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Correct not found check
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@ -47,7 +47,7 @@ end
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function Base.iterate(iter::OverlapIterator)
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refindex = findfirst(isequal(iter.refname), iter.reader.refseqnames)
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if refindex == 0
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if refindex === nothing
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throw(ArgumentError("sequence name $(iter.refname) is not found in the header"))
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end
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@assert iter.reader.index !== nothing
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