==== tests/cases/conformance/interfaces/interfaceDeclarations/derivedInterfaceIncompatibleWithBaseIndexer.ts (8 errors) ====
    interface Base {
        [x: number]: { x: number; y: number; };
        [x: string]: { x: number; }
    }
    
    interface Derived extends Base {
        1: { y: number } // error
        ~~~~~~~~~~~~~~~~
!!! Property '1' of type '{ y: number; }' is not assignable to numeric index type '{ x: number; y: number; }'.
        ~~~~~~~~~~~~~~~~
!!! Property '1' of type '{ y: number; }' is not assignable to string index type '{ x: number; }'.
    }
    
    interface Derived2 extends Base {
        '1': { y: number } // error
        ~~~~~~~~~~~~~~~~~~
!!! Property ''1'' of type '{ y: number; }' is not assignable to numeric index type '{ x: number; y: number; }'.
        ~~~~~~~~~~~~~~~~~~
!!! Property ''1'' of type '{ y: number; }' is not assignable to string index type '{ x: number; }'.
    }
    
    interface Derived3 extends Base {
        foo: { y: number } // error
        ~~~~~~~~~~~~~~~~~~
!!! Property 'foo' of type '{ y: number; }' is not assignable to string index type '{ x: number; }'.
    }
    
    interface Derived4 extends Base {
        foo(): { x: number } // error
        ~~~~~~~~~~~~~~~~~~~~
!!! Property 'foo' of type '() => { x: number; }' is not assignable to string index type '{ x: number; }'.
    }
    
    // satisifies string indexer but not numeric indexer
    interface Derived5 extends Base {
        1: { x: number } // error
        ~~~~~~~~~~~~~~~~
!!! Property '1' of type '{ x: number; }' is not assignable to numeric index type '{ x: number; y: number; }'.
    }
    
    interface Derived5 extends Base {
        '1': { x: number } // error
        ~~~
!!! Duplicate identifier ''1''.
    }