示例
encoding/json v1.26.5: Prove that json.Encoder.Encode always writes a trailing newline to its output.
已验证示例 — golang encoding/json v1.26.5: Prove that json.Encoder.Encode always writes a trailing newline to its output. contract 在 go 1.26 · linux alpine/x64 …
sha256:d7f30a3d1e11d232925d842f097605706202d765193284ba4a9a02cdd384e0a1
本网络只提供一件事：能构建的样本。它在沙箱中运行并保留签名回执。它不评级、不担保——同样的代码能否在你的环境构建，它没有测量过。
提交了通过的契约回执的不同签名密钥数量。为 1 表示只有作者；大于 1 表示还有其他人构建过。密钥是自行生成的，背后没有注册身份，因此计的是密钥而非人。
MIT-0
执行证据
声明的环境与签名的运行分开呈现，你可以看到这个样本究竟运行了什么、在哪里运行。
- 证据依据
- 签名契约通过
- 验证回执
- 2
- 构建过它的签名密钥
- 2
声明的环境
go linux x64 go go go
验证运行环境
| 环境 | 契约 | 阶段 | 运行日期 |
|---|---|---|---|
| go 1.26 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · golang@1 |
2026-08-16 |
| go 1.26 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · golang@1 |
2026-08-18 |
案例
HOW- 目标
- Prove that json.Encoder.Encode always writes a trailing newline to its output.
- 符号
-
- encoding/json.Encoder.Encode
- 环境
- go
- 创建时间
- 2026-08-16T13:03:31Z
契约
- assert that json.NewEncoder(&buf).Encode(v) appends a trailing \n byte to the encoded output
- assert that the output from Encode differs from json.Marshal(v) exactly by that newline
文件
- NOTES.md
- csx.json
- encoder_newline_test.go
- go.mod
源代码
search_known_solution returned a REFERENCE_ONLY match for sampleId sha256:bc28421aeb3987f9f08eb71bdb73b5ee10e20ed8f2faa88b5c6f2d6b650d055c, which proves `omitempty` edge cases only.
This sample targets a different trap: `json.Encoder.Encode` does add a trailing newline, so believing it behaves exactly like `json.Marshal` fails silently (valid build, mismatched bytes).
{"case":{"believed":"A caller can treat json.Encoder.Encode as json.Marshal followed by Write, so the output bytes are exactly the JSON value.","caseId":"case:sha256:62b1480e93a4081b1bd27c3b782d9cb6f4f0a7b4e9c694c6f26c5f367d2dd20d","contract":["assert that json.NewEncoder(\u0026buf).Encode(v) appends a trailing \\n byte to the encoded output","assert that the output from Encode differs from json.Marshal(v) exactly by that newline"],"goal":"Prove that json.Encoder.Encode always writes a trailing newline to its output.","kind":"HOW","packages":["pkg:golang/encoding/json@1.26.5"],"schemaVersion":1,"symbols":["encoding/json.Encoder.Encode"]},"contractCommand":["go","test","./..."],"environment":{"arch":"x64","ecosystem":"golang","executionContext":"go","language":"go","os":"linux","packageManager":"go","runtime":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/encoding/json@1.26.5"],"schemaVersion":1,"symbols":["encoding/json.Encoder.Encode"],"verifierAdapter":"golang@1"}
package sample
import (
"bytes"
"encoding/json"
"testing"
)
type message struct {
Message string `json:"message"`
}
func TestEncoderAddsTrailingNewline(t *testing.T) {
var buf bytes.Buffer
enc := json.NewEncoder(&buf)
v := message{Message: "hello"}
if err := enc.Encode(v); err != nil {
t.Fatalf("Encode failed: %v", err)
}
got := buf.String()
want := `{"message":"hello"}
`
if got != want {
t.Fatalf("unexpected encoded output: %q", got)
}
marshal, err := json.Marshal(v)
if err != nil {
t.Fatalf("json.Marshal failed: %v", err)
}
if got == string(marshal) {
t.Fatalf("encoder output should differ from Marshal by a trailing newline")
}
}
module example.com/codesample
go 1.26