[libcxx-commits] [libcxx] [libc++][ranges][enumerate_view] Update sentinel `equal` test (PR #222331)

[Lucas Mellone via libcxx-commits]

lknknm wrote:

> But have we been testing the constraints of this operator==?

Still not sure... Should we reference https://github.com/llvm/llvm-project/pull/74655 ?

https://github.com/llvm/llvm-project/pull/222331