Migrate AD backends to a group env (test/Extensions/Project.toml)#552
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ChrisRackauckas merged 1 commit intoJul 4, 2026
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Move the heavy optional AD/analysis backends Mooncake, Zygote, and SparseConnectivityTracer out of the root package's old-style [extras]/[targets].test and into a dedicated group env test/Extensions/Project.toml (the group whose test files actually `using` them). All three are used only in test/Extensions/*.jl. This stops the root/Core Downgrade lane from floor-resolving the Mooncake/Zygote joint dependency graph: the jdc-52 downgrade harness drops these three from its "Independently downgrading N weakdep extension(s)" set (7 -> 4) and no longer writes Manifest-Mooncake, Manifest-Zygote, or Manifest-SparseConnectivityTracer, while the base project still resolves. The cross-backend AD tests are unchanged; the SciMLTesting folder harness auto-activates the group env, so runtests.jl (run_tests()) needs no wiring. All three moved packages remain [weakdeps] (they gate extensions), so their root [compat] entries are kept (no dangling-compat resolver error). No package is a pure test-only extra here, so no [compat] deletion is needed. Co-Authored-By: Chris Rackauckas <accounts@chrisrackauckas.com>
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What
Moves the heavy optional AD/analysis backends Mooncake, Zygote, and SparseConnectivityTracer out of the root package's old-style
[extras]/[targets].testand into a dedicated group envtest/Extensions/Project.toml— the group whose test files (test/Extensions/{mooncake,zygote,sparseconnectivitytracer}_tests.jl) actuallyusingthem. All three are used only intest/Extensions/*.jl.Why
With the backends in the root test target, the root/Core Downgrade lane floor-resolves the Mooncake/Zygote joint dependency graph (the well-known Mooncake+Zygote joint-floor wall). Moving them into a group env means the root project no longer even attempts that joint floor-check.
Verified with the jdc-52 downgrade harness on Julia 1.12.6 (fresh depot each run):
Manifest-{Mooncake,Zygote,SparseConnectivityTracer}.tomlwritten?Both runs exit 0; the base project still
Successfully resolvedafter the move.How it stays correct
[weakdeps](they gateDataInterpolationsMooncakeExt/DataInterpolationsSparseConnectivityTracerExt; Zygote is a declared weakdep), so their root[compat]entries are kept — no dangling-compat resolver error. No pure test-only extra was moved, so no[compat]deletion was needed.test/runtests.jl(run_tests()) needs no wiring change.Validation (all run locally on Julia 1.12.6)
julia --project=test/Extensions -e 'using Pkg; Pkg.develop(path="."); Pkg.instantiate()'→ exit 0; resolves Mooncake 0.5.36, Zygote 0.7.11, SparseConnectivityTracer 1.2.2, ForwardDiff 1.4.1;DataInterpolationsMooncakeExt+DataInterpolationsSparseConnectivityTracerExtprecompile.GROUP=CorePkg.test(root env, without the backends): passes — extrapolation 106/106, interface 28/28, interpolation 17412 pass / 5 pre-existing broken, parameter 20/20; "Testing DataInterpolations tests passed".Please ignore until reviewed by @ChrisRackauckas.