go-tests-stage-toolchain-not-available-clean-machine
Solution written to ~/solution.md.
Problem: Go test fixtures hardcode a modern go directive (e.g. go 1.26) into a generated go.mod. On a machine with older Go, GOTOOLCHAIN=auto attempts to download the newer toolchain and fails with toolchain not available — an environment-dependent, clean-machine-only failure.
Root cause: The go directive is a minimum toolchain request. When it exceeds the running toolchain, Go tries to fetch a newer one; if unavailable, the build aborts. The test subject (timeout coercion) doesn't need a specific Go version, so the pin is unnecessary fragility.
Fix: Detect the local toolchain (go version → (major, minor)), write that version into the generated go.mod, and pytest.skip with a clear reason when Go is absent or below a floor. I provided a gotoolchain.py helper plus the corrected fixture.
Verified (all runs observed):
- Real Go 1.26 → pass, directive 1.26
- Simulated Go 1.22 → pass, directive 1.22 (no download attempted)
- Go 1.20 (below floor) → skip: Go >= 1.21 required, found 1.20.14
- No Go on PATH → skip: no Go toolchain found on PATH
- Before/after: hardcoded go 1.99.0 reproduces toolchain not available, exit 1
The markdown includes the exact error reproduction, copy-pasteable code, commands, and a before/after table so it's directly usable.
# Evidence - Problem class: go-tests-stage-toolchain-not-available-clean-machine - Model: openrouter/deepseek/deepseek-v4.1-flash - Solved: 2026-09-29T10:29:50.435Z - Verification: solution produced by pi in sandbox; see signatures.json
{"description": "", "environment": "", "language": "", "model": "openrouter/deepseek/deepseek-v4.1-flash", "problem_class": "go-tests-stage-toolchain-not-available-clean-machine", "provider": "openrouter", "solved_at": "2026-09-29T10:29:50.436Z", "version": ""}Solution written to ~/solution.md.
Problem: Go test fixtures hardcode a modern go directive (e.g. go 1.26) into a generated go.mod. On a machine with older Go, GOTOOLCHAIN=auto attempts to download the newer toolchain and fails with toolchain not available — an environment-dependent, clean-machine-only failure.
Root cause: The go directive is a minimum toolchain request. When it exceeds the running toolchain, Go tries to fetch a newer one; if unavailable, the build aborts. The test subject (timeout coercion) doesn't need a specific Go version, so the pin is unnecessary fragility.
Fix: Detect the local toolchain (go version → (major, minor)), write that version into the generated go.mod, and pytest.skip with a clear reason when Go is absent or below a floor. I provided a gotoolchain.py helper plus the corrected fixture.
Verified (all runs observed):
- Real Go 1.26 → pass, directive 1.26
- Simulated Go 1.22 → pass, directive 1.22 (no download attempted)
- Go 1.20 (below floor) → skip: Go >= 1.21 required, found 1.20.14
- No Go on PATH → skip: no Go toolchain found on PATH
- Before/after: hardcoded go 1.99.0 reproduces toolchain not available, exit 1
The markdown includes the exact error reproduction, copy-pasteable code, commands, and a before/after table so it's directly usable.
# Evidence - Problem class: go-tests-stage-toolchain-not-available-clean-machine - Model: openrouter/deepseek/deepseek-v4.1-flash - Solved: 2026-09-29T10:29:50.435Z - Verification: solution produced by pi in sandbox; see signatures.json
{"description": "", "environment": "", "language": "", "model": "openrouter/deepseek/deepseek-v4.1-flash", "problem_class": "go-tests-stage-toolchain-not-available-clean-machine", "provider": "openrouter", "solved_at": "2026-09-29T10:29:50.436Z", "version": ""}