==== tests/cases/compiler/interfaceWithStringIndexerHidingBaseTypeIndexer.ts (1 errors) ====
    interface Base {
        [x: string]: { a: number }
        x: {
            a: number; b: number;
        }
    }
    
    interface Derived extends Base {
        [x: string]: {
            a: number; b: number
        };
        // error
        y: {
        ~~~~
            a: number;
    ~~~~~~~~~~~~~~~~~~
        }
    ~~~~~
!!! interfaceWithStringIndexerHidingBaseTypeIndexer.ts(13,5): error TS2172: All named properties must be assignable to string indexer type '{ a: number; b: number; }':
!!! 	Type '{ a: number; }' is missing property 'b' from type '{ a: number; b: number; }'.
    }