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## 可以通过move struct中的字段，来解决borrow和mut borrow无法共存的问题
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```rust
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struct Foo {
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bar: Bar
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}
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let bar: &Bar = &foo.bar;
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let foo_mut: &mut Foo = &mut foo; // Can’t do it.
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println!("{}{}", foo_mut, bar);
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```
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If you no longer need Bar as a field of Foo, you can move it out instead of borrowing. This way you will be able to obtain Bar and still be able to mutate Foo.
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```rust
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struct Foo {
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bar: Option<Bar>
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}
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let bar: Bar = foo.bar.take(); // sets option to None
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let foo_mut: &mut Foo = &mut foo;
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println!("{}{}", foo_mut, bar);
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```
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