`@static_unpack` does not seem to work as advertised

[mchitre]

Describe the bug 🐞

The example for @static_unpack in v0.15 release notes (see NEWS.md) fails.

Expected behavior

Straight from the NEWS.md:

julia> x = ComponentArray(a=5, b=[4, 1], c = [1 2; 3 4], d=(e=2, f=[6, 30.0]));

julia> @static_unpack a, b, c, d = x;

julia> a
5.0

julia> b
2-element SVector{2, Float64} with indices SOneTo(2):
 4.0
 1.0

julia> c
2×2 SMatrix{2, 2, Float64, 4} with indices SOneTo(2)×SOneTo(2):
 1.0  2.0
 3.0  4.0

julia> d
ComponentVector{Float64,SubArray...}(e = 2.0, f = [6.0, 30.0])

Minimal Reproducible Example 👇

This is what I get:

julia> x = ComponentArray(a=5, b=[4, 1], c = [1 2; 3 4], d=(e=2, f=[6, 30.0]));

julia> @static_unpack a, b, c, d = x;
ERROR: MethodError: no method matching (StaticArraysCore.SVector{2})(::SubArray{Float64, 1, Vector{Float64}, Tuple{UnitRange{Int64}}, true})
The type `StaticArraysCore.SVector{2}` exists, but no method is defined for this combination of argument types when trying to construct it.
Stacktrace:
 [1] _maybe_SArray(x::SubArray{Float64, 1, Vector{Float64}, Tuple{UnitRange{Int64}}, true}, ::Val{2}, ::FlatAxis)
   @ ComponentArrays ~/.julia/packages/ComponentArrays/7tm5j/src/compat/static_arrays.jl:5
 [2] macro expansion
   @ ./abstractarray.jl:0 [inlined]
 [3] static_getproperty(ca::ComponentVector{Float64, Vector{Float64}, Tuple{Axis{…}}}, ::Val{:b})
   @ ComponentArrays ~/.julia/packages/ComponentArrays/7tm5j/src/compat/static_arrays.jl:9
 [4] top-level scope
   @ REPL[50]:1
Some type information was truncated. Use `show(err)` to see complete types.

Environment (please complete the following information):

• Output of using Pkg; Pkg.status()

Status `/private/var/folders/hx/kbmkkbqd0rxbwlgymb6hfkmh0000gn/T/jl_4YHy5n/Project.toml`
  [b0b7db55] ComponentArrays v0.15.19
  [a0c0ee7d] DifferentiationInterface v0.6.27
  [f6369f11] ForwardDiff v0.10.38

• Output of using Pkg; Pkg.status(; mode = PKGMODE_MANIFEST)

Status `/private/var/folders/hx/kbmkkbqd0rxbwlgymb6hfkmh0000gn/T/jl_4YHy5n/Manifest.toml`
  [47edcb42] ADTypes v1.11.0
  [79e6a3ab] Adapt v4.1.1
  [4fba245c] ArrayInterface v7.17.1
  [d360d2e6] ChainRulesCore v1.25.0
  [bbf7d656] CommonSubexpressions v0.3.1
  [f70d9fcc] CommonWorldInvalidations v1.0.0
  [34da2185] Compat v4.16.0
  [b0b7db55] ComponentArrays v0.15.19
  [187b0558] ConstructionBase v1.5.8
  [163ba53b] DiffResults v1.1.0
  [b552c78f] DiffRules v1.15.1
  [a0c0ee7d] DifferentiationInterface v0.6.27
  [ffbed154] DocStringExtensions v0.9.3
  [f6369f11] ForwardDiff v0.10.38
  [d9f16b24] Functors v0.5.2
  [615f187c] IfElse v0.1.1
  [92d709cd] IrrationalConstants v0.2.2
  [692b3bcd] JLLWrappers v1.6.1
  [2ab3a3ac] LogExpFunctions v0.3.28
  [1914dd2f] MacroTools v0.5.13
  [77ba4419] NaNMath v1.0.2
  [aea7be01] PrecompileTools v1.2.1
  [21216c6a] Preferences v1.4.3
  [ae029012] Requires v1.3.0
  [276daf66] SpecialFunctions v2.4.0
  [aedffcd0] Static v1.1.1
  [0d7ed370] StaticArrayInterface v1.8.0
  [1e83bf80] StaticArraysCore v1.4.3
  [efe28fd5] OpenSpecFun_jll v0.5.5+0
  [0dad84c5] ArgTools v1.1.2
  [56f22d72] Artifacts v1.11.0
  [2a0f44e3] Base64 v1.11.0
  [ade2ca70] Dates v1.11.0
  [f43a241f] Downloads v1.6.0
  [7b1f6079] FileWatching v1.11.0
  [b27032c2] LibCURL v0.6.4
  [76f85450] LibGit2 v1.11.0
  [8f399da3] Libdl v1.11.0
  [37e2e46d] LinearAlgebra v1.11.0
  [56ddb016] Logging v1.11.0
  [d6f4376e] Markdown v1.11.0
  [ca575930] NetworkOptions v1.2.0
  [44cfe95a] Pkg v1.11.0
  [de0858da] Printf v1.11.0
  [9a3f8284] Random v1.11.0
  [ea8e919c] SHA v0.7.0
  [fa267f1f] TOML v1.0.3
  [a4e569a6] Tar v1.10.0
  [cf7118a7] UUIDs v1.11.0
  [4ec0a83e] Unicode v1.11.0
  [e66e0078] CompilerSupportLibraries_jll v1.1.1+0
  [deac9b47] LibCURL_jll v8.6.0+0
  [e37daf67] LibGit2_jll v1.7.2+0
  [29816b5a] LibSSH2_jll v1.11.0+1
  [c8ffd9c3] MbedTLS_jll v2.28.6+0
  [14a3606d] MozillaCACerts_jll v2023.12.12
  [4536629a] OpenBLAS_jll v0.3.27+1
  [05823500] OpenLibm_jll v0.8.1+2
  [83775a58] Zlib_jll v1.2.13+1
  [8e850b90] libblastrampoline_jll v5.11.0+0
  [8e850ede] nghttp2_jll v1.59.0+0
  [3f19e933] p7zip_jll v17.4.0+2

• Output of versioninfo()

Julia Version 1.11.2
Commit 5e9a32e7af2 (2024-12-01 20:02 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: macOS (arm64-apple-darwin24.0.0)
  CPU: 10 × Apple M1 Pro
  WORD_SIZE: 64
  LLVM: libLLVM-16.0.6 (ORCJIT, apple-m1)
Threads: 1 default, 0 interactive, 1 GC (on 8 virtual cores)