==== tests/cases/conformance/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameterWithConstraints4.ts (18 errors) ====
    // checking whether other types are subtypes of type parameters with constraints
    
    class Foo { foo: number; }
    function f<T extends Foo, U extends Foo, V>(t: T, u: U, v: V) {
        // error
        var r = true ? t : u;
                ~~~~~~~~~~~~
!!! No best common type exists between 'T' and 'U'.
        var r = true ? u : t;
                ~~~~~~~~~~~~
!!! No best common type exists between 'U' and 'T'.
    
        // error
        var r2 = true ? t : v;
                 ~~~~~~~~~~~~
!!! No best common type exists between 'T' and 'V'.
        var r2 = true ? v : t;
                 ~~~~~~~~~~~~
!!! No best common type exists between 'V' and 'T'.
    
        // error
        var r3 = true ? v : u;
                 ~~~~~~~~~~~~
!!! No best common type exists between 'V' and 'U'.
        var r3 = true ? u : v;
                 ~~~~~~~~~~~~
!!! No best common type exists between 'U' and 'V'.
    
        // ok
        var r4 = true ? t : new Foo();
        var r4 = true ? new Foo() : t;
    
        // ok
        var r5 = true ? u : new Foo();
        var r5 = true ? new Foo() : u;
    
        // BUG, should be error
        var r6 = true ? v : new Foo();
                 ~~~~~~~~~~~~~~~~~~~~
!!! No best common type exists between 'V' and 'Foo'.
        var r6 = true ? new Foo() : v;
                 ~~~~~~~~~~~~~~~~~~~~
!!! No best common type exists between 'Foo' and 'V'.
    
    }
    
    class B1<T> {
        foo: T;
    }
    
    class D1<T extends Foo, U extends Foo, V> extends B1<Foo> {
        [x: string]: Foo;
        foo: T; // ok
    }
    
    class D2<T extends Foo, U extends Foo, V> extends B1<Foo> {
        [x: string]: Foo;
        foo: U; // ok
    }
    
    class D3<T extends Foo, U extends Foo, V> extends B1<Foo> {
          ~~
!!! Class 'D3<T, U, V>' incorrectly extends base class 'B1<Foo>':
!!!   Types of property 'foo' are incompatible:
!!!     Type 'V' is not assignable to type 'Foo':
!!!       Property 'foo' is missing in type '{}'.
        [x: string]: Foo;
        foo: V; // error
        ~~~~~~~
!!! Property 'foo' of type 'V' is not assignable to string index type 'Foo'.
    }
    
    class D4<T extends Foo, U extends Foo, V> extends B1<T> {
        [x: string]: T;
        foo: T; // ok
    }
    
    class D5<T extends Foo, U extends Foo, V> extends B1<T> {
          ~~
!!! Class 'D5<T, U, V>' incorrectly extends base class 'B1<T>':
!!!   Types of property 'foo' are incompatible:
!!!     Type 'U' is not assignable to type 'T'.
        [x: string]: T;
        foo: U; // error
        ~~~~~~~
!!! Property 'foo' of type 'U' is not assignable to string index type 'T'.
    }
    
    class D6<T extends Foo, U extends Foo, V> extends B1<T> {
          ~~
!!! Class 'D6<T, U, V>' incorrectly extends base class 'B1<T>':
!!!   Types of property 'foo' are incompatible:
!!!     Type 'V' is not assignable to type 'T'.
        [x: string]: T;
        foo: V; // error
        ~~~~~~~
!!! Property 'foo' of type 'V' is not assignable to string index type 'T'.
    }
    
    class D7<T extends Foo, U extends Foo, V> extends B1<U> {
          ~~
!!! Class 'D7<T, U, V>' incorrectly extends base class 'B1<U>':
!!!   Types of property 'foo' are incompatible:
!!!     Type 'T' is not assignable to type 'U'.
        [x: string]: U;
        foo: T; // error
        ~~~~~~~
!!! Property 'foo' of type 'T' is not assignable to string index type 'U'.
    }
    
    class D8<T extends Foo, U extends Foo, V> extends B1<U> {
        [x: string]: U;
        foo: U; // ok
    }
    
    class D9<T extends Foo, U extends Foo, V> extends B1<U> {
          ~~
!!! Class 'D9<T, U, V>' incorrectly extends base class 'B1<U>':
!!!   Types of property 'foo' are incompatible:
!!!     Type 'V' is not assignable to type 'U'.
        [x: string]: U;
        foo: V; // error
        ~~~~~~~
!!! Property 'foo' of type 'V' is not assignable to string index type 'U'.
    }