.cloned() is stable but std::iter::Cloned is not

[huonw]

rust/src/libcore/iter.rs

Line 1014 in 4ce08a5

#[stable(feature = "rust1", since = "1.0.0")]

vs.

rust/src/libcore/iter.rs

Line 1373 in 4ce08a5

#[unstable(feature = "core", reason = "recent addition")]

Accidental mismatch? cc @alexcrichton, @aturon

[alexcrichton]

Yeah I believe this is just an accident, I've submitted #25496 for this.