=== tests/cases/compiler/doesNotNarrowUnionOfConstructorsWithInstanceof.ts ===
class A {
>A : Symbol(A, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 0, 0))

    length: 1
>length : Symbol(A.length, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 0, 9))

    constructor() {
      this.length = 1
>this.length : Symbol(A.length, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 0, 9))
>this : Symbol(A, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 0, 0))
>length : Symbol(A.length, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 0, 9))
    }
}

class B {
>B : Symbol(B, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 5, 1))

    length: 2
>length : Symbol(B.length, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 7, 9))

    constructor() {
      this.length = 2
>this.length : Symbol(B.length, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 7, 9))
>this : Symbol(B, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 5, 1))
>length : Symbol(B.length, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 7, 9))
    }
}

function getTypedArray(flag: boolean) {
>getTypedArray : Symbol(getTypedArray, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 12, 1))
>flag : Symbol(flag, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 14, 23))

  return flag ? new A() : new B();
>flag : Symbol(flag, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 14, 23))
>A : Symbol(A, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 0, 0))
>B : Symbol(B, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 5, 1))
}
function getTypedArrayConstructor(flag: boolean) {
>getTypedArrayConstructor : Symbol(getTypedArrayConstructor, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 16, 1))
>flag : Symbol(flag, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 17, 34))

  return flag ? A : B;
>flag : Symbol(flag, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 17, 34))
>A : Symbol(A, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 0, 0))
>B : Symbol(B, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 5, 1))
}
const a = getTypedArray(true);              // A | B
>a : Symbol(a, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 20, 5))
>getTypedArray : Symbol(getTypedArray, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 12, 1))

const b = getTypedArrayConstructor(false);  // A constructor | B constructor
>b : Symbol(b, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 21, 5))
>getTypedArrayConstructor : Symbol(getTypedArrayConstructor, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 16, 1))

if (!(a instanceof b)) {
>a : Symbol(a, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 20, 5))
>b : Symbol(b, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 21, 5))

  console.log(a.length);  // Used to be property 'length' does not exist on type 'never'.
>console.log : Symbol(Console.log, Decl(lib.dom.d.ts, --, --))
>console : Symbol(console, Decl(lib.dom.d.ts, --, --))
>log : Symbol(Console.log, Decl(lib.dom.d.ts, --, --))
>a.length : Symbol(length, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 0, 9), Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 7, 9))
>a : Symbol(a, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 20, 5))
>length : Symbol(length, Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 0, 9), Decl(doesNotNarrowUnionOfConstructorsWithInstanceof.ts, 7, 9))
}