[flemzord]

The root and standalone fixture shells import a Go compiler recipe into an older package set, which prevents reuse of the published compiler cache. Select upstream stable go_1_27 and its matching buildGo127Module through a dedicated nixpkgs-go input at 1f607aa79b6356ed45d3cd3c8079c196e79efa2c (Go 1.27.3). Build the retained golangci-lint 2.15.0 recipe with that package set; stable's linter is only 2.12.2. Keep GOTOOLCHAIN=local.

Every pre-existing lock node stays unchanged in both flakes. The fixture's Go 1.23.0 language minimum, source, Just recipes and self-test workflow are unchanged. No mockgen or additional compiler helpers exist in this repository. No documentation describes the removed workaround.

Validation

• Both flakes parse with nix-instantiate --parse; nix flake metadata --no-write-lock-file succeeds for both. Stable lock metadata exactly matches the verified input in dst #23 and the stable locked metadata in go-libs #720, following ledger #2391.
• With import-from-derivation disabled, both full shell derivations evaluate on x86_64-linux, aarch64-linux and aarch64-darwin. Go is 1.27.3, lint is 2.15.0, and both the module builder and linter select the exact upstream compiler path.
• Stable Go, builder and retained lint recipe also evaluate independently on x86_64-darwin. Full-shell evaluation there fails because the unchanged unstable input dropped Intel macOS; the exact base reproduces the same error. All four declared systems remain unchanged.
• All four upstream compiler store paths return HTTP 200 narinfo responses from cache.nixos.org. No compiler or linter was realized.
• Lightweight static checks pass: every pre-existing lock node is preserved, root/fixture flakes and locks remain identical, compiler recipe imports/overrides are removed, whitespace is clean, and fixture source/module/Justfile plus self-test workflow blob hashes match the exact base.

Draft pending hosted qualification. No local Go executable is available, so fixture just pre-commit and just tests were not run. Full builds, lint, race/coverage suites and container setup were not run under the shared-host resource limit. The retained linter may still require its own build. CI has not been polled.

Created with gpt-6.1-sol in T3 Code through the Codex harness.