Bugzilla

I can also reproduce this in the shell: 

```js
class Mainclass {
    #declaredPrivateField = 42;	// Line 2
}

m.#declaredPrivateField = 23;	// Line 5
m.#undeclaredPrivateField = 23;	// Line 6
``

With line 5 commented out we get 

```
/Users/mgaudet/tmp/t.js:6:2 SyntaxError: reference to undeclared private field or method #undeclaredPrivateField:
/Users/mgaudet/tmp/t.js:6:2 m.#undeclaredPrivateField = 23;     // Line 6
/Users/mgaudet/tmp/t.js:6:2 ..^
```

With line 5 un-commented, we get: 

```
/Users/mgaudet/tmp/t.js:2:4 SyntaxError: reference to undeclared private field or method #declaredPrivateField
```

My recollection was that we stored information in the used names tracker to handle these sorts of error message problems, but this is definitely a huge paper cut.

I can also reproduce this in the shell: 

```js
class Mainclass {
    #declaredPrivateField = 42;	// Line 2
}

m.#declaredPrivateField = 23;	// Line 5
m.#undeclaredPrivateField = 23;	// Line 6
```

With line 5 commented out we get 

```
/Users/mgaudet/tmp/t.js:6:2 SyntaxError: reference to undeclared private field or method #undeclaredPrivateField:
/Users/mgaudet/tmp/t.js:6:2 m.#undeclaredPrivateField = 23;     // Line 6
/Users/mgaudet/tmp/t.js:6:2 ..^
```

With line 5 un-commented, we get: 

```
/Users/mgaudet/tmp/t.js:2:4 SyntaxError: reference to undeclared private field or method #declaredPrivateField
```
My recollection was that we stored information in the used names tracker to handle these sorts of error message problems, but this is definitely a huge paper cut.