==== tests/cases/conformance/types/typeRelationships/subtypesAndSuperTypes/subtypingWithObjectMembers2.ts (6 errors) ====
    interface Base {
        foo: string;
    }
    
    interface Derived extends Base {
        bar: string;
    }
    
    // N and M have the same name, same accessibility, same optionality, and N is a subtype of M
    // foo properties are valid, bar properties cause errors in the derived class declarations
    module NotOptional {
        interface A {
            foo: Base;
            bar: Base;
        }
    
        interface B extends A {
                  ~
!!! Interface 'B' incorrectly extends interface 'A':
!!!   Types of property 'bar' are incompatible:
!!!     Type 'string' is not assignable to type 'Base':
!!!       Property 'foo' is missing in type 'String'.
            foo: Derived; // ok
            bar: string; // error
        }
    
        interface A2 {
            1: Base;
            2.0: Base;
        }
    
        interface B2 extends A2 {
                  ~~
!!! Interface 'B2' incorrectly extends interface 'A2':
!!!   Types of property '2.0' are incompatible:
!!!     Type 'string' is not assignable to type 'Base':
!!!       Property 'foo' is missing in type 'String'.
            1: Derived; // ok
            2: string; // error
        }
    
        interface A3 {
            '1': Base;
            '2.0': Base;
        }
    
        interface B3 extends A3 {
                  ~~
!!! Interface 'B3' incorrectly extends interface 'A3':
!!!   Types of property ''2.0'' are incompatible:
!!!     Type 'string' is not assignable to type 'Base':
!!!       Property 'foo' is missing in type 'String'.
            '1': Derived; // ok
            '2.0': string; // error
        }
    }
    
    // same cases as above but with optional
    module Optional {
        interface A {
            foo?: Base;
            bar?: Base;
        }
    
        interface B extends A {
                  ~
!!! Interface 'B' incorrectly extends interface 'A':
!!!   Types of property 'bar' are incompatible:
!!!     Type 'string' is not assignable to type 'Base':
!!!       Property 'foo' is missing in type 'String'.
            foo?: Derived; // ok
            bar?: string; // error
        }
    
        interface A2 {
            1?: Base;
            2.0?: Base;
        }
    
        interface B2 extends A2 {
                  ~~
!!! Interface 'B2' incorrectly extends interface 'A2':
!!!   Types of property '2.0' are incompatible:
!!!     Type 'string' is not assignable to type 'Base':
!!!       Property 'foo' is missing in type 'String'.
            1?: Derived; // ok
            2?: string; // error
        }
    
        interface A3 {
            '1'?: Base;
            '2.0'?: Base;
        }
    
        interface B3 extends A3 {
                  ~~
!!! Interface 'B3' incorrectly extends interface 'A3':
!!!   Types of property ''2.0'' are incompatible:
!!!     Type 'string' is not assignable to type 'Base':
!!!       Property 'foo' is missing in type 'String'.
            '1'?: Derived; // ok
            '2.0'?: string; // error
        }
    }