flow errors when using this in class method argument defaults

[nrser]

this sort of thing works in babel-land:

class A {
  x: string;
  
  constructor(x: string) {
    this.x = x;
  }
  
  f(x = this.x) {
    // ...
  }
}

but flow (using v0.35.0) doesn't like it (seems to see this as the global object). maybe this is an anti-pattern of sorts, but it's quite convenient; would be nice if it type-checked.

[vkurchatkin]

See: #1234

[nrser]

thanks. did some searches but didn't see that one.