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			14 lines
		
	
	
		
			188 B
		
	
	
	
		
			Rust
		
	
	
	
	
	
			
		
		
	
	
			14 lines
		
	
	
		
			188 B
		
	
	
	
		
			Rust
		
	
	
	
	
	
| trait A<Y, N> {
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|     type B;
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| }
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| type MaybeBox<T> = <T as A<T, Box<T>>>::B;
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| struct P {
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|     t: MaybeBox<P>
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| }
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| impl<Y, N> A<Y, N> for P {
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|     type B = N;
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| }
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| fn main() {
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|     let t: MaybeBox<P>;
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| }
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