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			10 lines
		
	
	
		
			218 B
		
	
	
	
		
			Rust
		
	
	
	
	
	
			
		
		
	
	
			10 lines
		
	
	
		
			218 B
		
	
	
	
		
			Rust
		
	
	
	
	
	
| //@ edition:2018
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| 
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| use std::future::Future;
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| fn foo<T: Send, U>(ty: T, ty1: U) -> impl Future<Output = (T, U)> + Send {
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|     //~^ Error future cannot be sent between threads safely
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|     async { (ty, ty1) }
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| }
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| 
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| fn main() {}
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