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=== tests/cases/conformance/classes/classDeclarations/classHeritageSpecification/classExtendingOptionalChain.ts ===
namespace A {
>A : Symbol(A, Decl(classExtendingOptionalChain.ts, 0, 0))
export class B {}
>B : Symbol(B, Decl(classExtendingOptionalChain.ts, 0, 13))
}
// ok
class C1 extends A?.B {}
>C1 : Symbol(C1, Decl(classExtendingOptionalChain.ts, 2, 1))
>A?.B : Symbol(A.B, Decl(classExtendingOptionalChain.ts, 0, 13))
>A : Symbol(A, Decl(classExtendingOptionalChain.ts, 0, 0))
>B : Symbol(A.B, Decl(classExtendingOptionalChain.ts, 0, 13))
// error
class C2 implements A?.B {}
>C2 : Symbol(C2, Decl(classExtendingOptionalChain.ts, 5, 24))
>A?.B : Symbol(A.B, Decl(classExtendingOptionalChain.ts, 0, 13))
>A : Symbol(A, Decl(classExtendingOptionalChain.ts, 0, 0))
>B : Symbol(A.B, Decl(classExtendingOptionalChain.ts, 0, 13))
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