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			14 lines
		
	
	
		
			171 B
		
	
	
	
		
			Rust
		
	
	
	
	
	
			
		
		
	
	
			14 lines
		
	
	
		
			171 B
		
	
	
	
		
			Rust
		
	
	
	
	
	
| //@ check-pass
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| 
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| #![warn(unused)]
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| 
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| macro_rules! m {
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|     ($a:tt $b:tt) => {
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|         $b $a;
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|     }
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| }
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| 
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| fn main() {
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|     m!(S struct); //~ WARN struct `S` is never constructed
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| }
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