Two declarations cannot have the same canonical name:
{% include “docs/reference/fidl/language/error-catalog/label/_bad.md” %}
{% includecode gerrit_repo="fuchsia/fuchsia" gerrit_path="tools/fidl/fidlc/tests/fidl/bad/fi-0035.test.fidl" exclude_regexp="\/\/ (Copyright 20|Use of|found in).*" %}
Even though COLOR and Color look different, they are both represented by the canonical name color. You get the canonical name by converting the original name to snake_case.
To fix the error, give each declaration a name that is unique after canonicalization:
{% include “docs/reference/fidl/language/error-catalog/label/_good.md” %}
{% includecode gerrit_repo="fuchsia/fuchsia" gerrit_path="tools/fidl/fidlc/tests/fidl/good/fi-0035.test.fidl" exclude_regexp="\/\/ (Copyright 20|Use of|found in).*" %}
Following the FIDL style guide's naming guidelines will minimize your chances of running into this error. Canonical name collisions will never happen between declarations that use the same casing style, and they will rarely happen between ones that use different styles because of other requirements (e.g. protocol names should usually be noun phrases ending in -er).
FIDL enforces this rule because bindings generators transform names to the idiomatic naming style for the target language. By ensuring unique canonical names, we guarantee that bindings can do this without producing name collisions. See RFC-0040: Identifier uniqueness for more details.
