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

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abstract contract A {
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function foo() internal virtual returns (uint256);
function test(uint8 _a) virtual internal returns (uint256);
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}
abstract contract B {
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function foo() internal virtual returns (uint256);
function test() internal virtual returns (uint256);
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}
abstract contract C {
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function foo() internal virtual returns (uint256);
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}
abstract contract D {
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function foo() internal virtual returns (uint256);
function test() internal virtual returns (uint256);
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}
abstract contract X is A, B, C, D {
function test() internal override(B, D, C) virtual returns (uint256);
function foo() internal override(A, C) virtual returns (uint256);
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}
// ----
// TypeError: (533-550): Invalid contract specified in override list: C.
// TypeError: (603-617): Function needs to specify overridden contracts B and D.