Repeating last print()/console.log() produces "SyntaxError:​ Unexpected token ILLEGAL" in QML/JS Console

Steps to reproduce:

1. Put a breakpoint within the Component.onCompleted handler below and start debugging.
2. Open the QML/JS Console.
3. Type:

   console.log(y)

   The result will be:

   400
       undefined
   

4. Press the up key to repeat the last command. The result will be:

   console.​​log(​​y)​​
       SyntaxError:​ Unexpected token ILLEGAL
   

The bug can be reproduced with any line that can be hit by the QML debugger.

import QtQuick 2.0
import QtQuick.Controls 1.0
import QtQuick.Controls.Styles 1.0

ApplicationWindow {
    x: 800
    y: 400
    width: 450
    height: 500

    Component.onCompleted: {
        y;
    }
}