The borrow checker handles references, the fact that everything is move-by-default when it's usually copy-by-defaut (C, C++) or reference-by-default (Java, C#),

The borrow checker handles references, the fact that everything is move-by-default when it's usually copy-by-defaut (C, C++) or reference-by-default (Java, C#), that's not really a borrow checker feature. Move and copy semantics exist in C++, too, but the defaults are different.