Linux? Probably another bug.
Try this:
unittest
{
    import core.exception : UnicodeException;
    void f()
    {
        string ret;
        int i = -1;
        ret ~= i;
    }

    try
    {
        f();
    }
    catch(UnicodeException e)
    {
        assert(e.msg == "Invalid UTF-8 sequence");
    }
}

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