solidity/test/libsolidity/syntaxTests/inheritance/unimplemented_without_virtual.sol

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abstract contract C {
	function f() external;
}
// ----
// TypeError: (23-45): Functions without implementation must be marked virtual.
Require unimplemented functions to be virtual. 2019-12-02 20:39:53 +00:00			`abstract contract C {`
			`function f() external;`
			`}`
			`// ----`
			`// TypeError: (23-45): Functions without implementation must be marked virtual.`