==== tests/cases/compiler/constructSignatureAssignabilityInInheritance.ts (3 errors) ====
    // Checking basic subtype relations with construct signatures
    
    module ConstructSignature {
        interface Base { // T
            // M's
            new (x: number): void; // BUG 842221
            ~~~~~~~~~~~~~~~~~~~~~
!!! constructSignatureAssignabilityInInheritance.ts(6,9): error TS2133: Constructors cannot have a return type of 'void'.
            new (x: number, y: number): number;
        }
    
        // S's
        interface I extends Base {
            // N's
            new (x: number): number; // satisfies subtype for both of base's call signatures
            new (x: number, y: number): boolean; // so this one hides the base type member that is identical modulo return types
        }
    
        interface Base2 { // T
            // M's
            new (x: number): number;
        }
    
        // S's
        interface I2 extends Base2 {
                  ~~
!!! constructSignatureAssignabilityInInheritance.ts(23,15): error TS2143: Interface 'ConstructSignature.I2' cannot extend interface 'ConstructSignature.Base2':
!!! 	Construct signatures of types 'I2' and 'Base2' are incompatible.
            // N's
            new (x: number): string; // error because return types don't match
        }
    
        // S's
        interface I3 extends Base2 {
            // N's
            new <T>(x: T): string; // ok, adds a new call signature
        }
    }
    
    module MemberWithConstructSignature {
        interface Base { // T
            // M's
            a: new (x: number) => void;
            a2: new (x: number, y: number) => void;
            a3: new <T>(x: T) => void;
        }
    
        var b: Base;
        var r = new b.a(1);
    
        // S's
        interface I extends Base {
            // N's
            a: new (x: number) => number; // ok because base returns void
            a2: new (x: number, y: number) => boolean; // ok because base returns void
            a3: new <T>(x: T) => string; // ok because base returns void
        }
    
        interface Base2 { // T
            // M's
            a: new (x: number) => number;
            a2: new <T>(x: T) => T;
        }
    
        // S's
        interface I2 extends Base2 {
                  ~~
!!! constructSignatureAssignabilityInInheritance.ts(61,15): error TS2143: Interface 'MemberWithConstructSignature.I2' cannot extend interface 'MemberWithConstructSignature.Base2':
!!! 	Types of property 'a' of types 'I2' and 'Base2' are incompatible:
!!! 		Construct signatures of types 'new(x: number) => string' and 'new(x: number) => number' are incompatible.
            // N's
            a: new (x: number) => string; // error because base returns non-void;
        }
    
        // S's
        interface I3 extends Base2 {
            // N's
            a2: new <T>(x: T) => string; // error because base returns non-void;
        }
    }