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@ -10662,6 +10662,8 @@ module ts {
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checkTypeAssignableTo(staticType, getTypeWithoutSignatures(staticBaseType), node.name || node,
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Diagnostics.Class_static_side_0_incorrectly_extends_base_class_static_side_1);
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if (!(staticBaseType.symbol && staticBaseType.symbol.flags & SymbolFlags.Class)) {
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// When the static base type is a "class-like" constructor function (but not actually a class), we verify
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// that all instantiated base constructor signatures return the same type.
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let constructors = getInstantiatedConstructorsForTypeArguments(staticBaseType, baseTypeNode.typeArguments);
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if (forEach(constructors, sig => getReturnTypeOfSignature(sig) !== baseType)) {
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error(baseTypeNode.expression, Diagnostics.Base_constructors_must_all_have_the_same_return_type);
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