Not all types can used in const declarations:
{% include “docs/reference/fidl/language/error-catalog/label/_bad.md” %}
{% includecode gerrit_repo="fuchsia/fuchsia" gerrit_path="tools/fidl/fidlc/tests/fidl/bad/fi-0059.test.fidl" exclude_regexp="\/\/ (Copyright 20|Use of|found in).*" %}
Convert to an allowed type, if possible:
{% include “docs/reference/fidl/language/error-catalog/label/_good.md” %}
{% includecode gerrit_repo="fuchsia/fuchsia" gerrit_path="tools/fidl/fidlc/tests/fidl/good/fi-0059.test.fidl" exclude_regexp="\/\/ (Copyright 20|Use of|found in).*" %}
Only FIDL primitives (bool, int8, int16, int32, int64, uint8, uint16, uint32, uint64, float32, float64) and non-optional string types may be used in the left-hand side of a const declaration.
