=== tests/cases/compiler/declareDottedExtend.ts ===
declare module A.B
>A : typeof A, Symbol(A, Decl(declareDottedExtend.ts, 0, 0))
>B : typeof B, Symbol(B, Decl(declareDottedExtend.ts, 0, 17))
{
    export class C{ }
>C : C, Symbol(C, Decl(declareDottedExtend.ts, 1, 1))
}

import ab = A.B;
>ab : typeof ab, Symbol(ab, Decl(declareDottedExtend.ts, 3, 1))
>A : typeof A, Symbol(A, Decl(declareDottedExtend.ts, 0, 0))
>B : typeof ab, Symbol(ab, Decl(declareDottedExtend.ts, 0, 17))

class D extends ab.C{ }
>D : D, Symbol(D, Decl(declareDottedExtend.ts, 5, 16))
>ab.C : any, Symbol(ab.C, Decl(declareDottedExtend.ts, 1, 1))
>ab : typeof ab, Symbol(ab, Decl(declareDottedExtend.ts, 3, 1))
>C : ab.C, Symbol(ab.C, Decl(declareDottedExtend.ts, 1, 1))

class E extends A.B.C{ }
>E : E, Symbol(E, Decl(declareDottedExtend.ts, 7, 23))
>A.B.C : any, Symbol(ab.C, Decl(declareDottedExtend.ts, 1, 1))
>A.B : typeof ab, Symbol(ab, Decl(declareDottedExtend.ts, 0, 17))
>A : typeof A, Symbol(A, Decl(declareDottedExtend.ts, 0, 0))
>B : typeof ab, Symbol(ab, Decl(declareDottedExtend.ts, 0, 17))
>C : ab.C, Symbol(ab.C, Decl(declareDottedExtend.ts, 1, 1))