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			14 lines
		
	
	
		
			490 B
		
	
	
	
		
			Solidity
		
	
	
	
	
	
			
		
		
	
	
			14 lines
		
	
	
		
			490 B
		
	
	
	
		
			Solidity
		
	
	
	
	
	
// The constructor of a base class should not be visible in the derived class
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contract A { constructor(string memory) { } }
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contract B is A {
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  function f() pure public {
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    A x = A(address(0)); // convert from address
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    string memory y = "ab";
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    A(y); // call as a function is invalid
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    x;
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  }
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}
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// ----
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// TypeError 3656: (124-303): Contract "B" should be marked as abstract.
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// TypeError 9640: (252-256): Explicit type conversion not allowed from "string memory" to "contract A".
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