docs/reference/fidl/language/error-catalog/_fi-0155.md

## fi-0155: Availability conflicts with parent {:#fi-0155}

This error occurs when you add an `@availability` attribute to a non-`library`
declaration that conflicts with the `library`'s declaration.

{% include "docs/reference/fidl/language/error-catalog/label/_bad.md" %}

```fidl
{% includecode gerrit_repo="fuchsia/fuchsia" gerrit_path="tools/fidl/fidlc/tests/fidl/bad/fi-0155-a.test.fidl" exclude_regexp="\/\/ (Copyright 20|Use of|found in).*" %}
```

```fidl
{% includecode gerrit_repo="fuchsia/fuchsia" gerrit_path="tools/fidl/fidlc/tests/fidl/bad/fi-0155-b.test.fidl" exclude_regexp="\/\/ (Copyright 20|Use of|found in).*" %}
```

To fix this error, update the `@availability` attributes to the required
constraints:

{% include "docs/reference/fidl/language/error-catalog/label/_good.md" %}

```fidl
{% includecode gerrit_repo="fuchsia/fuchsia" gerrit_path="tools/fidl/fidlc/tests/fidl/good/fi-0155.test.fidl" exclude_regexp="\/\/ (Copyright 20|Use of|found in).*" %}
```