Support DiffEqBase v7 / SciMLBase v3 breaking update (completes #188)#190
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ChrisRackauckas merged 2 commits intoJun 14, 2026
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DiffEqBase 7.5 (OrdinaryDiffEq v7 / DifferentialEquations v8) removes the deprecated DEProblem and DEAlgorithm aliases. Switch the abstract supertypes to AbstractDEProblem and AbstractDEAlgorithm, which are available across both the old (DiffEqBase 6.210, SciMLBase 2.153) and new (DiffEqBase 7.5, SciMLBase 3) compat bounds, and widen the DiffEqBase compat to 7.5. Co-Authored-By: Chris Rackauckas <accounts@chrisrackauckas.com> Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
The Downgrade CI pins every dependency to its compat lower bound. With DiffEqBase pinned to its floor 6.210.1, the old Enzyme floor 0.13.0 is unsatisfiable: DiffEqBase 6.210.1 requires Enzyme >= 0.13.100 (via its DiffEqBaseEnzymeExt compat). Additionally, EnzymeTestUtils 0.2.0 is runtime -incompatible with Enzyme 0.13.100 — it calls guaranteed_const_nongen(T, nothing) where the newer Enzyme expects a world-age UInt64, erroring in the sensitivity_interface test. EnzymeTestUtils 0.2.4 (the version that raised its own Enzyme floor to 0.13.78) fixes this. Verified locally on Julia 1.10 with all deps pinned to their floors (DiffEqBase 6.210.1, SciMLBase 2.153.0, Enzyme 0.13.100, EnzymeTestUtils 0.2.4): full GROUP=Core suite passes (147 testsets). Co-Authored-By: Chris Rackauckas <accounts@chrisrackauckas.com> Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Added a commit bumping the test-only Enzyme floors so the Downgrade CI resolves and passes:
Verified locally on Julia 1.10 with every dependency pinned to its compat floor (DiffEqBase 6.210.1, SciMLBase 2.153.0, Enzyme 0.13.100, EnzymeTestUtils 0.2.4, …): full |
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Summary
Makes the source changes required for the DiffEqBase v7.5 / SciMLBase v3 breaking update (the OrdinaryDiffEq v7 / DifferentialEquations v8 release), and widens the
DiffEqBasecompat accordingly. This is the working counterpart to the compat-only Dependabot PR #188 — that PR bumps the compat bound but, on its own, would fail to load against DiffEqBase 7.5 because of removed API.What broke
DiffEqBase 7.5 / SciMLBase 3 remove the deprecated
DEProblemandDEAlgorithmaliases. This package used both as abstract supertypes, so loading against the new versions fails.Changes
AbstractStateSpaceProblem <: DEProblem→<: AbstractDEProblemAbstractDifferenceEquationAlgorithm <: DEAlgorithm→<: AbstractDEAlgorithmusingimport updatesDiffEqBasecompat widened to"6.210.1, 7.5"inProject.tomlandtest/Project.tomlAbstractDEProblem/AbstractDEAlgorithmexist in both compat bounds (verified: DiffEqBase 6.210.1 / SciMLBase 2.153.1 and DiffEqBase 7.5.5 / SciMLBase 3.20.0), so the dual-version compat range is preserved and the Downgrade CI stays green.No behavioral change —
DEProblem/DEAlgorithmwere always just deprecated aliases for theAbstract*types.Testing
Ran locally on Julia 1.10 against DiffEqBase 7.5.5 / SciMLBase 3.20.0:
GROUP=Coresuite (CI=true): 147 testsets, all pass, exit 0.Also confirmed lower-bound symbol availability under DiffEqBase 6.210.1 / SciMLBase 2.153.1.
🚧 Draft — please ignore until reviewed by @ChrisRackauckas. Supersedes / completes #188 (which can be closed once this merges).
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