fi-0073: Composing non-protocol {:#fi-0073}

Only protocols can be used in compose statements:

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

{% includecode gerrit_repo="fuchsia/fuchsia" gerrit_path="tools/fidl/fidlc/tests/fidl/bad/fi-0073.test.fidl" exclude_regexp="\/\/ (Copyright 20|Use of|found in).*" %}

Make sure the name you are referring to points to a protocol:

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

{% includecode gerrit_repo="fuchsia/fuchsia" gerrit_path="tools/fidl/fidlc/tests/fidl/good/fi-0073.test.fidl" exclude_regexp="\/\/ (Copyright 20|Use of|found in).*" %}