
`ForwardIter() - ForwardIter()` returns `ptrdiff_t`, and converting it to an unsigned type isn't guaranteed to produce the same type as `size_t`. Reviewed By: #libc, ldionne Differential Revision: https://reviews.llvm.org/D141456
`ForwardIter() - ForwardIter()` returns `ptrdiff_t`, and converting it to an unsigned type isn't guaranteed to produce the same type as `size_t`. Reviewed By: #libc, ldionne Differential Revision: https://reviews.llvm.org/D141456