Inline arrow function inside constructor misinterpreted as constructor args

[samdenty]

TypeScript Version: 3.3.0-dev.201xxxxx

Search Terms:

'this' cannot be referenced in constructor arguments.

Code

class Test {
  constructor() {
    const func = (a = this) => 1
  }
}

Expected behavior:

Typescript shouldn't produce any errors, as this is not referenced inside the constructors parameters.

Actual behavior:

Typescript misinterprets the default parameter of the inline arrow function as a default parameter of the constructor (which is not allowed, and should produce an error).

Playground Link: here

Related Issues: None

[ajafff]

Fix is up at #29298