fix: fix panic in destructure_struct_binding
#20708
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Example
---
```rust
struct Foo { x: () }
struct Bar { foo: Foo }
fn f(Bar { mut $0foo }: Bar) {}
```
**Before this PR**:
Panic `Option::unwrap`
**After this PR**:
```rust
struct Foo { x: () }
struct Bar { foo: Foo }
fn f(Bar { foo: Foo { mut x } }: Bar) {}
```
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changed the title
Foo{mut x} for destructure_struct_bindingdestructure_struct_binding
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Example
Before this PR:
Panic
Option::unwrapAfter this PR: