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			6 lines
		
	
	
		
			141 B
		
	
	
	
		
			Solidity
		
	
	
	
	
	
			
		
		
	
	
			6 lines
		
	
	
		
			141 B
		
	
	
	
		
			Solidity
		
	
	
	
	
	
| abstract contract C {
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| 	function f() external;
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| }
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| // ----
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| // TypeError 5424: (23-45): Functions without implementation must be marked virtual.
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