(；a, b, c) = x syntax

(；a, b, c) = x syntax.ipynb

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      "source": "nt = (a = 1.0, b = 2.0, c = [3.0, 4.0], d = [5.0, 6.0])",
      "execution_count": 1,
      "outputs": [
        {
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          "execution_count": 1,
          "data": {
            "text/plain": "(a = 1.0, b = 2.0, c = [3.0, 4.0], d = [5.0, 6.0])"
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    {
      "metadata": {
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      "cell_type": "code",
      "source": "(; d, b) = nt\nb, d",
      "execution_count": 2,
      "outputs": [
        {
          "output_type": "execute_result",
          "execution_count": 2,
          "data": {
            "text/plain": "(2.0, [5.0, 6.0])"
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      ]
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    {
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      "cell_type": "code",
      "source": "module A\nBase.@kwdef struct Foo{T, U<:AbstractArray{T}}\n    a::T = 11.0\n    b::T = 12.0\n    c::U = [13.0, 14.0]\n    d::U = [15.0, 16.0]\nend\nend\n\nfoo = A.Foo()",
      "execution_count": 3,
      "outputs": [
        {
          "output_type": "execute_result",
          "execution_count": 3,
          "data": {
            "text/plain": "Main.A.Foo{Float64, Vector{Float64}}(11.0, 12.0, [13.0, 14.0], [15.0, 16.0])"
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    {
      "metadata": {
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      "cell_type": "code",
      "source": "(; c, a) = foo\na, c",
      "execution_count": 4,
      "outputs": [
        {
          "output_type": "execute_result",
          "execution_count": 4,
          "data": {
            "text/plain": "(11.0, [13.0, 14.0])"
          },
          "metadata": {}
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      ]
    },
    {
      "metadata": {
        "trusted": true
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      "cell_type": "code",
      "source": "using ComponentArrays\n\nca = ComponentArray(a = 21.0, b = 22.0, c = [23.0, 24.0], d = [25.0, 26.0])",
      "execution_count": 5,
      "outputs": [
        {
          "output_type": "execute_result",
          "execution_count": 5,
          "data": {
            "text/plain": "ComponentVector{Float64}(a = 21.0, b = 22.0, c = [23.0, 24.0], d = [25.0, 26.0])"
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    {
      "metadata": {
        "trusted": true
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      "cell_type": "code",
      "source": "(; a, d) = ca\na, d",
      "execution_count": 6,
      "outputs": [
        {
          "output_type": "execute_result",
          "execution_count": 6,
          "data": {
            "text/plain": "(21.0, [25.0, 26.0])"
          },
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    {
      "metadata": {
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      "cell_type": "code",
      "source": "2ca",
      "execution_count": 7,
      "outputs": [
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          "output_type": "execute_result",
          "execution_count": 7,
          "data": {
            "text/plain": "ComponentVector{Float64}(a = 42.0, b = 44.0, c = [46.0, 48.0], d = [50.0, 52.0])"
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          "metadata": {}
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    },
    {
      "metadata": {
        "trusted": true
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      "cell_type": "code",
      "source": "ca .- 20",
      "execution_count": 8,
      "outputs": [
        {
          "output_type": "execute_result",
          "execution_count": 8,
          "data": {
            "text/plain": "ComponentVector{Float64}(a = 1.0, b = 2.0, c = [3.0, 4.0], d = [5.0, 6.0])"
          },
          "metadata": {}
        }
      ]
    },
    {
      "metadata": {
        "trusted": true
      },
      "cell_type": "code",
      "source": "ca .- 20 == ComponentArray(nt)",
      "execution_count": 9,
      "outputs": [
        {
          "output_type": "execute_result",
          "execution_count": 9,
          "data": {
            "text/plain": "true"
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          "metadata": {}
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      ]
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    {
      "metadata": {
        "trusted": true
      },
      "cell_type": "code",
      "source": "f((; c, a)) = @show a c",
      "execution_count": 10,
      "outputs": [
        {
          "output_type": "execute_result",
          "execution_count": 10,
          "data": {
            "text/plain": "f (generic function with 1 method)"
          },
          "metadata": {}
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    },
    {
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      "cell_type": "code",
      "source": "methods(f)",
      "execution_count": 11,
      "outputs": [
        {
          "output_type": "execute_result",
          "execution_count": 11,
          "data": {
            "text/plain": "# 1 method for generic function \"f\":\n[1] f(::Any) in Main at In[10]:1",
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    {
      "metadata": {
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      "cell_type": "code",
      "source": "f(nt);",
      "execution_count": 13,
      "outputs": [
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          "output_type": "stream",
          "text": "a = 1.0\nc = [3.0, 4.0]\n",
          "name": "stdout"
        }
      ]
    },
    {
      "metadata": {
        "trusted": true
      },
      "cell_type": "code",
      "source": "f(foo);",
      "execution_count": 14,
      "outputs": [
        {
          "output_type": "stream",
          "text": "a = 11.0\nc = [13.0, 14.0]\n",
          "name": "stdout"
        }
      ]
    },
    {
      "metadata": {
        "trusted": true
      },
      "cell_type": "code",
      "source": "f(ca);",
      "execution_count": 15,
      "outputs": [
        {
          "output_type": "stream",
          "text": "a = 21.0\nc = [23.0, 24.0]\n",
          "name": "stdout"
        }
      ]
    },
    {
      "metadata": {
        "trusted": true
      },
      "cell_type": "code",
      "source": "",
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