==== tests/cases/conformance/types/typeRelationships/subtypesAndSuperTypes/subtypingWithCallSignaturesWithSpecializedSignatures.ts (1 errors) ====
    // same as subtypingWithCallSignatures but with additional specialized signatures that should not affect the results
    
    module CallSignature {
        interface Base { // T
            // M's
            (x: 'a'): void;
            (x: string, y: number): void;
        }
    
        // S's
        interface I extends Base {
            // N's
            (x: 'a'): number; // ok because base returns void
            (x: string, y: number): number; // ok because base returns void
            <T>(x: T): string; // ok because base returns void
        }
    
        interface Base2 { // T
            // M's
            (x: 'a'): number;
            (x: string): number;
        }
    
        // S's
        interface I2 extends Base2 {
            // N's
            (x: 'a'): string;
            (x: string): string; // error because base returns non-void;
        }
    
        // S's
        interface I3 extends Base2 {
            // N's
            <T>(x: T): string; // ok, adds a new call signature
        }
    }
    
    module MemberWithCallSignature {
        interface Base { // T
            // M's
            a: {
                (x: 'a'): void;
                (x: string): void;
            }
            a2: {
                (x: 'a', y: number): void;
                (x: string, y: number): void;
            }
            a3: <T>(x: T) => void;
        }
    
        // S's
        interface I extends Base {
            // N's
            a: (x: string) => number; // ok because base returns void
            a2: (x: string, y: number) => boolean; // ok because base returns void
            a3: <T>(x: T) => string; // ok because base returns void
        }
    
        interface Base2 { // T
            // M's
            a: {
                (x: 'a'): number;
                (x: string): number;
            }
            a2: <T>(x: T) => T;
        }
    
        // S's
        interface I2 extends Base2 {
                  ~~
!!! Interface 'I2' incorrectly extends interface 'Base2':
!!!   Types of property 'a' are incompatible:
!!!     Type '(x: string) => string' is not assignable to type '{ (x: 'a'): number; (x: string): number; }':
!!!       Type 'string' is not assignable to type 'number'.
            // N's
            a: (x: string) => string; // error because base returns non-void;
        }
    
        // S's
        interface I3 extends Base2 {
            // N's
            a2: <T>(x: T) => string; // error because base returns non-void;
        }
    }