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			16 lines
		
	
	
		
			342 B
		
	
	
	
		
			Rust
		
	
	
	
	
	
			
		
		
	
	
			16 lines
		
	
	
		
			342 B
		
	
	
	
		
			Rust
		
	
	
	
	
	
| //@ edition:2021
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| 
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| // FIXME(async_closures): This needs a better error message!
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| 
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| #![feature(async_closure)]
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| 
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| fn main() {
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|     fn needs_fn<T>(_: impl FnMut() -> T) {}
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| 
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|     let mut x = 1;
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|     needs_fn(async || {
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|         //~^ ERROR  async closure does not implement `FnMut` because it captures state from its environment
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|         x += 1;
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|     });
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| }
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