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

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abstract contract A {
function test() external virtual returns (uint256);
function test2() external returns (uint256) {}
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}
abstract contract X is A {
function test() external returns (uint256) {}
function test2() external override(A) returns (uint256) {}
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}
// ----
// TypeError 9456: (153-198): Overriding function is missing "override" specifier.
// TypeError 4334: (76-122): Trying to override non-virtual function. Did you forget to add "virtual"?