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Bug: Chained this-intersecting methods don't work from within class
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<!-- Please try to reproduce the issue with `typescript@next`. It may have already been fixed. -->
**TypeScript Version:** 3.1.1-insiders.20180926
<!-- Search terms you tried before logging this (so others can find this issue more easily) -->
**Search Terms:** this chain
**Code**
```ts
class Builder {
private _class: undefined;
withFoo<T>() {
return this as this & { foo: T }
}
withBar<T>() {
return this as this & { bar: T }
}
withFooBar<T>() {
return this.withFoo<T>().withBar<T>();
}
}
let good = new Builder().withFoo<number>().withBar<number>();
let bad = new Builder().withFooBar<number>();
good = bad;
```
**Expected behavior:**
`good` & `bad` should be identical
**Actual behavior:**
`bad` is missing `foo`
**Playground Link:** http://www.typescriptlang.org/play/#src=class%20Builder%20%7B%0D%0A%20%20%20%20private%20_class%3A%20undefined%3B%0D%0A%20%20%20%20withFoo%3CT%3E()%20%7B%0D%0A%20%20%20%20%20%20%20%20return%20this%20as%20this%20%26%20%7B%20foo%3A%20T%20%7D%0D%0A%20%20%20%20%7D%0D%0A%20%20%20%20withBar%3CT%3E()%20%7B%0D%0A%20%20%20%20%20%20%20%20return%20this%20as%20this%20%26%20%7B%20bar%3A%20T%20%7D%0D%0A%20%20%20%20%7D%0D%0A%20%20%20%20withFooBar%3CT%3E()%20%7B%0D%0A%20%20%20%20%20%20%20%20return%20this.withFoo%3CT%3E().withBar%3CT%3E()%3B%0D%0A%20%20%20%20%7D%0D%0A%7D%0D%0A%0D%0Alet%20good%20%3D%20new%20Builder().withFoo%3Cnumber%3E().withBar%3Cnumber%3E()%3B%0D%0Alet%20bad%20%3D%20new%20Bu…
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