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

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abstract contract A {
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function foo() internal virtual returns (uint256);
function test(uint8 _a) internal virtual 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, D) virtual returns (uint256);
function foo() internal override(A, C, B, B, B, D ,D) virtual returns (uint256);
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}
// ----
// TypeError 4520: (548-549): Duplicate contract "D" found in override list of "test".
// TypeError 4520: (621-622): Duplicate contract "B" found in override list of "foo".
// TypeError 4520: (624-625): Duplicate contract "B" found in override list of "foo".
// TypeError 4520: (630-631): Duplicate contract "D" found in override list of "foo".