Strange Behavior for try-while-errorcondition in Julia v0.7

CorrectedBehavior.jl.v07.ipynb

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     "text": [
      "Julia Version 0.7.0-rc1.0\n",
      "Commit 15fcc7c4e6 (2018-07-31 20:29 UTC)\n",
      "Platform Info:\n",
      "  OS: macOS (x86_64-apple-darwin14.5.0)\n",
      "  CPU: Intel(R) Core(TM) i7-5557U CPU @ 3.10GHz\n",
      "  WORD_SIZE: 64\n",
      "  LIBM: libopenlibm\n",
      "  LLVM: libLLVM-6.0.0 (ORCJIT, broadwell)\n"
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    {
     "data": {
      "text/plain": [
       "calc (generic function with 1 method)"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "function calc(x, y, z)\n",
    "    if z > 5\n",
    "        throw(ArgumentError(\"z ($z) must to be ≤ 5.\"))\n",
    "    end\n",
    "    x + y * z\n",
    "end"
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     "end_time": "2018-08-02T10:19:09.354000+09:00",
     "start_time": "2018-08-02T01:19:09.247Z"
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "calc_z (generic function with 1 method)"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "function calc_z(n)\n",
    "    z = 0\n",
    "    try\n",
    "        while calc(0, 3, z) < n\n",
    "            z += 1\n",
    "        end\n",
    "    catch ex\n",
    "        if ex isa ArgumentError\n",
    "            # pass\n",
    "        else\n",
    "            rethrow()\n",
    "        end\n",
    "    end    \n",
    "    z - 1\n",
    "end"
   ]
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     "end_time": "2018-08-02T10:19:10.584000+09:00",
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    {
     "data": {
      "text/plain": [
       "3"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
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   "source": [
    "calc_z(10)"
   ]
  },
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   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2018-08-02T10:19:11.257000+09:00",
     "start_time": "2018-08-02T01:19:11.255Z"
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "5"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "calc_z(20)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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ExpectedBehavior.jl.v06.ipynb

StrangeBehavior.jl.v07.ipynb