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abstract contract A {
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function foo ( ) internal virtual returns ( uint256 ) ;
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}
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abstract contract B {
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function foo ( ) internal virtual returns ( uint8 ) ;
function test ( ) internal virtual returns ( uint256 ) ;
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}
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abstract contract X is A , B {
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function test ( ) internal override virtual returns ( uint256 ) ;
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}
// ----
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// TypeError: (203-296): Derived contract must override function "foo". Function with the same name and parameter types defined in two or more base classes.