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			3 lines
		
	
	
		
			133 B
		
	
	
	
		
			Rust
		
	
	
	
	
	
			
		
		
	
	
			3 lines
		
	
	
		
			133 B
		
	
	
	
		
			Rust
		
	
	
	
	
	
fn force<F>(f: F) -> isize where F: FnOnce() -> isize { f() }
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fn main() { println!("{}", force(|| {})); } //~ ERROR mismatched types
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