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			11 lines
		
	
	
		
			181 B
		
	
	
	
		
			Rust
		
	
	
	
	
	
			
		
		
	
	
			11 lines
		
	
	
		
			181 B
		
	
	
	
		
			Rust
		
	
	
	
	
	
| // check-pass
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| 
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| pub fn keys<'a>(x: &'a Result<u32, u32>) -> impl std::fmt::Debug + 'a {
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|     match x {
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|         Ok(map) => Ok(map),
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|         Err(map) => Err(map),
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|     }
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| }
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| 
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| fn main() {}
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