Sample
Unmarshal YAML documents into yaml.Node AST where top-level mappings are wrapped in a DocumentNode and mapping entries are stored as a flat slice of alternating key and value nodes.
sha256:5a3c517c14c2b02913bd1dddf4ceb354fa20a12daf9bd8874291fdb094b5e78b
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
Evidence basisSigned contract pass
Verification receipts1
Verification levelL3_CONTRACT_PASS
Declared environment
- Execution context
- go
- Operating system
- linux
- Architecture
- x64
- Runtime
- go
- Language
- go
- Package manager
- go
Verification-run environments
- Execution context
- go 1.26
- Operating system
- linux alpine · musl
- Architecture
- x64
- Runtime
- go 1.26
- Language
- go
- Package manager
- go
- Execution
- container · docker
CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · golang@1 · 2026-08-17
Case
- Goal
- Unmarshal YAML documents into yaml.Node AST where top-level mappings are wrapped in a DocumentNode and mapping entries are stored as a flat slice of alternating key and value nodes. HOW
- Packages
-
gopkg.in/yaml.v3 v3.0.1
- Environment
- go
- Created
- 2026-08-17T20:57:24Z
Commonly assumed
Unmarshaling a YAML mapping directly into *yaml.Node produces a MappingNode whose Content slice holds child values.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- yaml.Unmarshal into *yaml.Node produces a root DocumentNode with Kind 1 whose Content slice wraps the top-level MappingNode (Kind 4) at index 0 rather than returning a MappingNode directly.
- MappingNode.Content is a flat slice of 2*N nodes where even indices hold key scalar nodes and odd indices hold value nodes.
- HeadComment annotations attach to key nodes while inline LineComment annotations attach to value nodes.
- yaml.Node.Decode decodes AST subtrees directly into Go struct types.
- In-place AST scalar modifications preserve HeadComment and LineComment annotations across yaml.Encoder serialization.
- Types implementing UnmarshalYAML(value *yaml.Node) receive AST position metadata (Line and Column) and can decode underlying values via value.Decode.
Files
- NOTES.md
- csx.json
- go.mod
- go.sum
- yaml_test.go
Download the source artifact (tar.gz)
Origin Seeder
csx-seed
Verification receipts
- go 1.26 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · golang@1 · 2026-08-17 · ed25519:d91480838ac982c9