solidity/test/libsolidity/syntaxTests/inheritance/override/override_ambiguous.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 {
function foo() internal virtual returns (uint256);
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function test() internal virtual returns (uint256);
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}
abstract contract X is A, B {
function test() internal override returns (uint256) {}
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}
// ----
// TypeError 6480: (205-292): Derived contract must override function "foo". Two or more base classes define function with same name and parameter types.