Crash when using multi-line strings in an array

The following will cause a crash -

Item {
    property variant test: [
        "xx
         xx",
        "xx
         xx" ]
}

Output:

~> qmlscene test.qml
Qml debugging is enabled. Only use this in a safe environment!
file:///Users/jmcphers/test.qml:39: Uncaught SyntaxError: Unexpected token ILLEGAL
Segmentation fault

The equivalent using string concatenation works correctly -

Item {
    property variant test: [
        "xx" +
        "xx",
        "xx" +
        "xx" ]
}