Function implementation name must be ... (2389) when abstract method is declared again later

还没有人认领这个 Issue。

### 🔎 Search Terms

duplicate abstract function declaration, abstract method, missing implementation, abstract method overload

### 🕗 Version & Regression Information

- This is the behavior in every version I tried, and I reviewed the FAQ for entries about abstract class

### ⏯ Playground Link

https://www.typescriptlang.org/play/?#code/IYIwzgLgTsDGEAJYBthjAgYge2wg3gFAIkKiQzwIBmArgHawAiApigIwAUAlAFwIA3bAEsAJgG5CxUnUasUAJh78Kw+gHMC00qSgsItKPQQByABbCT2hAF9r18tDiJZzNsi59BIiYTtA

### 💻 Code

```ts
abstract class Foo {
abstract func1(): void;

func2(): string {
// ^? Function implementation name must be 'func1'.(2389)
return 'hi'
}

abstract func1(): void;
}
```

### 🙁 Actual behavior

TS error reported for `func2`, which is valid.

### 🙂 Expected behavior

TS error reported for `func1`, which has duplicated abstract declaration.

### Additional information about the issue

_No response_

使用 TypeScript Playground 链接和 issue 中的抽象类示例重现该诊断。跟踪编译器如何为重复的抽象声明分配实现名称错误；完成的标准是错误指向重复的 func1 声明，而不是有效的 func2 实现。

由索引模型根据 Issue 内容生成。