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

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abstract contract A {
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function foo() internal virtual returns (uint256);
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}
abstract contract B is A {
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function foo() internal override virtual returns (uint256);
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}
abstract contract C is B {
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function foo() internal override virtual returns (uint256);
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}
abstract contract D is C {
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function foo() internal override virtual returns (uint256);
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}
abstract contract X is D {
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function foo() internal override returns (uint256);
}
// ----