carlosgalvezp wrote:

```cpp
auto sub2 = s.subspan(n);        // transforms to: auto sub2 = s.last(s.size() 
- n);
```

IMHO the transformed code is less readable. It would be more useful to do the 
opposite transformation, maybe that's what you intended?

```cpp
auto sub2 = s.subspan(s.size() - n);        // transforms to: auto sub2 = 
s.last(n);
```

https://github.com/llvm/llvm-project/pull/118074
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