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			11 lines
		
	
	
		
			169 B
		
	
	
	
		
			Rust
		
	
	
	
	
	
			
		
		
	
	
			11 lines
		
	
	
		
			169 B
		
	
	
	
		
			Rust
		
	
	
	
	
	
trait Foo {
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    fn bar() -> impl std::fmt::Display;
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}
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impl Foo for () {
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    fn bar() -> () {}
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    //~^ ERROR `()` doesn't implement `std::fmt::Display`
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}
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fn main() {}
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