# traceView

A trace view record carrying subject, state, detail, nextStep.

Last updated: 2026-09-09

Package: diagnostics | Status: source-declared

Tags: cpu, diagnostics, method, source-example, thing, yeho

Describe failures, collect runtime traces, and make execution observable.

```yh
external thing traceView
```

- text subject: Stores subject as text.
- text state: Stores state as text.
- text detail: Stores detail as text.
- text nextStep: Stores next step as text.
- traceView(text subject, text state, text detail, text nextStep): Trace view.
- Render() returns text: Render.

## Use traceView

A complete small caller. Values are illustrative; check the returned result and package requirements before connecting live resources.

Verification: type checked

```yh
using diagnostics

// Describe failures, collect runtime traces, and make execution observable.
traceView sample = traceView("subject", "state", "detail", "next Step")
Console.Log(Text.From(sample.subject))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.diagnostics__traceview"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

[[dependencies]]
package = "console"
version = "0.1.0"
path = "../../../yeho/packages/console"

[[dependencies]]
package = "diagnostics"
version = "0.1.0"
path = "../../../yeho/packages/diagnostics"

```

Extract the example archive beside the yeho and dolphin checkouts. This example requires those source dependencies and a current developer compiler.

```sh
./yeho/build/dolphin-metal/yehoc ./api-examples/diagnostics--traceView/usage --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


## traceView.Render

A complete caller for this public method. Sample inputs are illustrative; native resources require their owning lifecycle.

Verification: type checked

```yh
using diagnostics

// Render.
traceView instance = traceView("subject", "state", "detail", "next Step")
text result = instance.Render()
Console.Log(Text.From(result))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.diagnostics__traceview"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

[[dependencies]]
package = "console"
version = "0.1.0"
path = "../../../yeho/packages/console"

[[dependencies]]
package = "diagnostics"
version = "0.1.0"
path = "../../../yeho/packages/diagnostics"

```

Extract the example archive beside the yeho and dolphin checkouts. This example requires those source dependencies and a current developer compiler.

```sh
./yeho/build/dolphin-metal/yehoc ./api-examples/diagnostics--traceView/method-Render-5 --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


Package presence and a declaration do not establish support on every host. Host services need their platform and lifecycle setup.

Source: yeho/packages/diagnostics/diagnostics.yh

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