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Elm 0.19.2 (released 2026-07-06) is a compiler performance release with no language changes. It refuses to build applications whose elm.json declares 0.19.1, so the fixture's elm.json now declares 0.19.2, and CI downloads the 0.19.2 binary (the release assets are named elm-0.19.2-linux-x64.gz; the old binary-for-linux-64-bit.gz naming is gone). The `Warmup.elm` cache pre-warm stays: concurrent cold-cache builds still corrupt the shared ELM_HOME package cache with 0.19.2 (verified: 16 parallel cold-cache `elm make` runs consistently fail without the warmup, and the fixtures pass with it). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Follow-up to #2959, which shipped on elm 0.19.1: Elm 0.19.2 was released 2026-07-06 (the first compiler release since 2019), and this moves the Elm fixture toolchain to it.
What 0.19.2 changes
Per the release notes and the "Faster Builds with Elm 0.19.2" post: compiler performance only (less parser allocation, lower GC/memory) — no language changes, so generated code is unaffected.
Changes here
test/fixtures/elm/elm.jsondeclares"elm-version": "0.19.2"— required, since 0.19.2 refuses to build applications declaring 0.19.1 (verified empirically).elm-0.19.2-linux-x64.gzinstead of 0.19.1'sbinary-for-linux-64-bit.gz).Warmup.elmELM_HOME pre-warm stays: 0.19.2 does not fix the concurrent cold-cache corruption. Verified empirically — 3 × 16 parallel cold-cacheelm makeruns against a shared fresh ELM_HOME failed consistently (5-9 of 16 compiles per run) without the warmup. Comments updated to say the issue is still reproducible with 0.19.2.Validation
With the 0.19.2 binary and a cold ELM_HOME:
QUICKTEST FIXTURE=elm,schema-elmpasses (100 run / 16 verified skips), and the full corpus passes (266 run: 215 JSON incl. misc + 67 schema, minus skips).npm run lintclean.🤖 Generated with Claude Code