solidity/test/libsolidity/syntaxTests/inheritance/override/override_missing_virtual.sol

abstract contract A {
	function test() external virtual returns (uint256);
	function test2() external returns (uint256) {}
}
abstract contract X is A {
	function test() external returns (uint256) {}
	function test2() external override(A) returns (uint256) {}
}
// ----
// TypeError: (153-198): Overriding function is missing "override" specifier.
// TypeError: (76-122): Trying to override non-virtual function. Did you forget to add "virtual"?
Implement virtual keyword 2019-11-05 17:25:34 +00:00			`abstract contract A {`
			`function test() external virtual returns (uint256);`
Require unimplemented functions to be virtual. 2019-12-02 20:39:53 +00:00			`function test2() external returns (uint256) {}`
Implement virtual keyword 2019-11-05 17:25:34 +00:00			`}`
			`abstract contract X is A {`
Require unimplemented functions to be virtual. 2019-12-02 20:39:53 +00:00			`function test() external returns (uint256) {}`
			`function test2() external override(A) returns (uint256) {}`
Implement virtual keyword 2019-11-05 17:25:34 +00:00			`}`
			`// ----`
Add more override tests with public state variables 2019-12-09 16:51:53 +00:00			`// TypeError: (153-198): Overriding function is missing "override" specifier.`
Require unimplemented functions to be virtual. 2019-12-02 20:39:53 +00:00			`// TypeError: (76-122): Trying to override non-virtual function. Did you forget to add "virtual"?`