Wrong completions for a closure

[satyaa21]

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Steps to reproduce:

1. Open https://codemirror.net/demo/tern.html
2. Paste below code

return {
    obj: {
      prop1: "2",
      prop2: "3"
    },
    func: function() {
      function innerFn() {
        this.obj.
      }
    }
  }

3. Press "Ctrl+space" at "this.obj."

Expected. No completions Actual: Invalid completions are shows