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			5 lines
		
	
	
		
			177 B
		
	
	
	
		
			Rust
		
	
	
	
	
	
			
		
		
	
	
			5 lines
		
	
	
		
			177 B
		
	
	
	
		
			Rust
		
	
	
	
	
	
| fn main() {
 | |
|     let x = Some(()).iter().map(|()| 1).sum::<f32>();
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|     //~^ ERROR a value of type `f32` cannot be made by summing an iterator over elements of type `{integer}`
 | |
| }
 | 
