Flow version: 0.98.1

The code below used to be working fine on versions < 0.89
Now it breaks on versions > 0.90

// @flow

type A = {
  foo: 'foo',
  bar: () => void
};

type B = {
  foo: 'foo'
};


function func(obj: A | B) {
  if (typeof obj.bar === 'function') obj.bar();
}

Expected behavior

No error.

Actual behavior

Error: Cannot call obj.bar because the parameter types of an unknown function [1] are unknown.

Try-Flow