Recordsgolanggolang.org/x/syncv0.20.0errgroup.WithContext
OS × runtime at a glance
22026-09-08
Reading a cell: The number is how many recorded observations the rate divides — one build files an observation per stage it reached, so it counts neither builds nor machines nor people. The document beside it is a different fact from a different source: whether a sample exists at that coordinate, and how our own run of it went there.
- no sample at this coordinate yet
- there is a sample here, and nothing of ours has run it at this coordinate yet
- there is a sample here, and our run of it at this coordinate came back clean
- there is a sample here, and our run of it at this coordinate failed
- there is a sample here, and this coordinate records both a passing and a failing run of it
- nothing recorded — unknown, never "works" and never "broken"
- there is a level below this cell — click to open it
A document means there is a sample at that coordinate. Whether one EXISTS is a fact about this release and this API and does not change with OS, runtime or package manager; its COLOUR is how that sample ran in the environment you are looking at.
Published samples
- golang.org/x/sync v0.20.0: errgroup.Group, errgroup.WithContext, singleflight.Group This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. HOWerrgroup.Grouperrgroup.WithContextsingleflight.Groupsemaphore.Weightedgo 1.26 MIT-0 · 2026-08-20
Compatibility matrix
Project-level observations and symbol/contract verifications are counted separately and never combined.
These counts do not distinguish how the symbol was called: overloads, argument shapes and options are pooled together. What a particular call shape does is proven by a sample's contract, not by these numbers.
| Environment | Confidence | Observations | Verified | Pass rate | Peers | Last seen |
|---|---|---|---|---|---|---|
| go 1.26 · Go · go · linux glibc · docker
Observations: PROJECT_TEST 1✓ — Verified: CONTRACT 1✓
|
LOW | 1 | 1 | 100% | 1 · 1✓ | 2026-09-08 |
| go 1.26 · Go · go · linux musl · docker
Verified: CONTRACT 1✓
|
LOW | 0 | 1 | 100% | 0 · 1✓ | 2026-08-20 |
snapshot · 2026-09-15
Failure clusters
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observed PROJECT_TEST Evidence gap ×8 v0.20.0 → v0.22.0 os=windows · runtime=go@1.26Evidence quality: legacy-evidence-incomplete · Environment variants: 1 · First recorded: 2026-08-17 · Last seen: 2026-08-17Diagnostic re-verification candidate
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observed PROJECT_COMPILE exit 1 ×3 v0.17.0 → v0.20.0 → v0.22.0 os=linux · runtime=go@1.26 sha256:964ddac6b19a…<path> <str> imported and not usedgo/compiler · compiler-diagnostic · outer go run, go testEvidence quality: complete · Environment variants: 1 · First recorded: 2026-08-31 · Last seen: 2026-09-19
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observed UNKNOWN exit 1 Evidence gap ×3 v0.12.0 → v0.20.0 os=linux sha256:91ad26545eb1…node:internal/modules/cjs/loader:<n> · throw err; · ^ · Error: Cannot find module <str>node · unclassified-diagnostic · outer node · gap stage-unknownEvidence quality: complete · Environment variants: 2 · First recorded: 2026-08-31 · Last seen: 2026-09-04Diagnostic re-verification candidate
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observed PROJECT_TEST exit 1 ×1 v0.20.0 os=linux · runtime=go@1.26 sha256:dda800f87ad3…--- FAIL: TestPathAndMethodMatchers (0.00s) · panic: interface conversion: interface {} is nil, not *caddy.Replacer [recovered, repanicked] …go/test · test-runner-diagnostic · outer go testEvidence quality: complete · Environment variants: 1 · First recorded: 2026-08-29 · Last seen: 2026-08-29
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observed PROJECT_RESOLVE exit 1 ×1 v0.20.0 os=linux · runtime=go@1.26 sha256:0facb7ea8a74…<path>:<n>:<n>: missing go.sum entry for module providing package github.com/KimMachineGun/automemlimit/memlimit (imported by github.<token>); to add: …go/module · resolve-diagnostic · outer go runEvidence quality: complete · Environment variants: 1 · First recorded: 2026-08-30 · Last seen: 2026-08-30
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observed UNKNOWN exit 1 Evidence gap ×1 v0.20.0 os=linux · runtime=go@1.26 sha256:f3a5a3011077…panic: interface conversion: interface {} is nil, not *caddy.Replacer · goroutine 1 [running]: …go · unclassified-diagnostic · outer go run · gap stage-unknownEvidence quality: complete · Environment variants: 1 · First recorded: 2026-08-30 · Last seen: 2026-08-30Diagnostic re-verification candidate
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observed PROJECT_COMPILE exit 1 ×1 v0.20.0 os=linux · runtime=go@1.26 sha256:7c3106d18a4a…<path> assignment mismatch: 1 variable but iterator.NewPageInfo returns 2 values · <path> not enough arguments in call to iterator.NewPageInfo …go/compiler · compiler-diagnostic · outer go testEvidence quality: complete · Environment variants: 1 · First recorded: 2026-08-31 · Last seen: 2026-08-31
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observed PROJECT_RESOLVE exit 1 ×1 v0.20.0 os=linux · runtime=go@1.26 sha256:c7d4da684991…<path>:<n>:<n>: missing go.sum entry for module providing package github.com/pkg/errors (imported by go.step.sm/crypto/pemutil); to add: …go/module · resolve-diagnostic · outer go runEvidence quality: complete · Environment variants: 1 · First recorded: 2026-08-31 · Last seen: 2026-08-31
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observed PROJECT_TEST exit 1 ×1 v0.20.0 os=linux · runtime=go@1.26 sha256:a79b247d4ade…panic: test timed out after 10m0s · running tests: · TestIterator (10m0s) · goroutine 6 [running]:go/test · test-runner-diagnostic · outer go testEvidence quality: complete · Environment variants: 1 · First recorded: 2026-08-31 · Last seen: 2026-08-31
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observed UNKNOWN exit 1 Evidence gap ×1 v0.20.0 os=linux · runtime=go@1.26 sha256:d6c9c8e0caa4…panic: cache must be initialized with a GetConfigForCert callback · goroutine 1 [running]: …go · unclassified-diagnostic · outer go run · gap stage-unknownEvidence quality: complete · Environment variants: 1 · First recorded: 2026-08-31 · Last seen: 2026-08-31Diagnostic re-verification candidate
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observed PROJECT_RESOLVE exit 1 ×1 v0.20.0 os=linux · runtime=go@1.26 sha256:de2bcfa430eb…<path>:<n>:<n>: missing go.sum entry for module providing package github.com/pkg/errors (imported by go.step.sm/crypto/pemutil); to add:go/module · resolve-diagnostic · outer go testEvidence quality: complete · Environment variants: 1 · First recorded: 2026-09-01 · Last seen: 2026-09-01
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observed PROJECT_TEST exit 1 ×1 v0.20.0 os=linux · runtime=go@1.26 sha256:defe7abc6f40…FAIL example.com/pemutil_contract [setup failed]go/test · test-runner-diagnostic · outer go testEvidence quality: complete · Environment variants: 1 · First recorded: 2026-09-01 · Last seen: 2026-09-01
Showing the 12 most-reported of 14 recorded failure clusters. The rest are single reports.