[ChrisRackauckas-Claude]

Julia 1.12 cannot precompile RuntimeGeneratedFunctions with the supported PrecompileTools 1.2.1 dependency: init defines generated_callfunc inside the workload's scope, so the subsequent call sees a method newer than its world age. Initialize the module at top level before entering the workload. A subprocess regression test exercises this dependency combination without changing the surrounding test environment.

The regression starts at 73411b2. Its parent passes the same Julia 1.12.7 / PrecompileTools 1.2.1 smoke check. A freshly resolved environment selects PrecompileTools 1.3.4 and passes, but 1.2.1 remains within the declared compatibility range; the failure also reproduces in a fresh environment pinned to 1.2.1.

Verification

The new test/shared/precompiletools_v1_2.jl script was run with the same Julia 1.12.7 executable against a clean master checkout and the fixed checkout, with separate initially empty project environments:

/home/crackauc/.juliaup/bin/julia +1.12.7 --startup-file=no \
  --project=.validation/rgf-julia112-audit/permanent-before-env \
  RuntimeGeneratedFunctions-worldage-audit/test/shared/precompiletools_v1_2.jl \
  "$PWD/RuntimeGeneratedFunctions-worldage-before"

Before, exit 1:

ERROR: LoadError: MethodError: no method matching generated_callfunc(..., ::Int64)
The applicable method may be too new: running in world age 38842, while current world is 38850.

The identical script with permanent-fixed-env and RuntimeGeneratedFunctions-worldage-audit exits 0. The full official Core runner includes this test:

GROUP=Core /home/crackauc/.juliaup/bin/julia +1.10.11 --project=RuntimeGeneratedFunctions-worldage-audit -e 'using Pkg; Pkg.test()'
GROUP=Core /home/crackauc/.juliaup/bin/julia +1.12.7 --project=RuntimeGeneratedFunctions-worldage-audit -e 'using Pkg; Pkg.resolve(); Pkg.test()'

Both exit 0 and end with:

Test Summary:                | Pass  Total
PrecompileTools 1.2 workload |    1      1
Testing RuntimeGeneratedFunctions tests passed

Pkg.resolve() was necessary before the 1.12 run because the local 1.10 manifest omitted the Serialization stdlib entry; the initial 1.12 invocation stopped before executing tests. The resolved full run passed.

GROUP=QA /home/crackauc/.juliaup/bin/julia +1.12.7 --project=RuntimeGeneratedFunctions-worldage-audit -e 'using Pkg; Pkg.test()'

Test Summary: | Pass  Total   Time
QA            |   20     20  33.2s
Testing RuntimeGeneratedFunctions tests passed

Runic checks on all three changed Julia files, typos on all changed files, and git diff --check pass. No test is skipped or weakened. Pkg is added only as a test extra; its MIT license matches the host package. No new runtime dependency or public API is introduced.

Not verified: docs build (no documentation/docstring/public-API change), downstream packages, or Julia prerelease. The subprocess test resolves a small package environment and therefore requires registry/package availability, as the existing test setup does.

Ignore this draft until reviewed by @ChrisRackauckas.

🤖 Generated with Codex CLI 0.153.4 (model: gpt-6-astra; local transcript: /home/crackauc/.codex/sessions/2026/09/05/rollout-2026-09-05T05-35-38-01a070ec-6fe3-7593-b7ea-92d4535aa542.jsonl).

[ChrisRackauckas-Claude]

Final verification: all 16 GitHub checks succeeded at commit cf9d4f9, including Core on Linux/macOS/Windows with LTS/current/prerelease Julia, QA, downgrade, documentation, formatting, and spelling. The branch has no commits behind the freshly fetched base and is merge-clean. It remains a draft for @ChrisRackauckas review.

Local failing-before/passing-after evidence, the bisected introducing commit, both local Core runs, and QA 20/20 are recorded in the PR body. No tests were skipped or weakened.

Links:

• Test matrix: https://github.com/SciML/RuntimeGeneratedFunctions.jl/actions/runs/33963798474
• Draft: Initialize the package module before precompile workloads #150

🤖 Codex CLI 0.153.4; model gpt-6-astra; local transcript /home/crackauc/.codex/sessions/2026/09/05/rollout-2026-09-05T05-35-38-01a070ec-6fe3-7593-b7ea-92d4535aa542.jsonl.