pkg/front_end/testcases/regress/issue_59870_01.dart.textual_outline.expect

abstract class A {}

class B implements A {}

abstract class I {}

abstract class J {}

mixin MAiBC on A implements B, C {}

mixin MBCiIJ on B, C implements I, J {}

class CAaMAiBC = A with MAiBC;

class CAaMAiBCaMBCiIJ_2 extends CAaMAiBC with MBCiIJ {}