This error occurs when a type is made optional twice. Usually, this occurs when the type is marked optional at both its use and declaration sites.
{% include “docs/reference/fidl/language/error-catalog/label/_bad.md” %}
{% includecode gerrit_repo="fuchsia/fuchsia" gerrit_path="tools/fidl/fidlc/tests/fidl/bad/fi-0160.test.fidl" exclude_regexp="\/\/ (Copyright 20|Use of|found in).*" %}
To fix this error, only make the type optional once.
For example, you can remove :optional
from the use site.
{% include “docs/reference/fidl/language/error-catalog/label/_good.md” %}
{% includecode gerrit_repo="fuchsia/fuchsia" gerrit_path="tools/fidl/fidlc/tests/fidl/good/fi-0160-a.test.fidl" exclude_regexp="\/\/ (Copyright 20|Use of|found in).*" %}
You could also remove :optional
from the alias declaration.
{% includecode gerrit_repo="fuchsia/fuchsia" gerrit_path="tools/fidl/fidlc/tests/fidl/good/fi-0160-b.test.fidl" exclude_regexp="\/\/ (Copyright 20|Use of|found in).*" %}