[llvm-dev] Is ArrayRef supposed to be immutable?

[Daniel Berlin via llvm-dev]

It seems like ArrayRefs are supposed to be immutable (
However, as far as i can tell, the iterators are defined wrong to make this
true.

While
ArrayRef<int> Foo(Something);
Foo[0] = 5;

will give a compile time error.

something like:

ArrayRef<int> Foo(Something);
std::sort(Foo.begin(), Foo.end());

Will work fine.

Is this expected?

(FWIW: I expected this to only work with a MutableArrayRef)
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