missing_size_annotation_carray

Fields of type 'Array' must have exactly one 'Array' annotation.

The analyzer produces this diagnostic when a field in a subclass of either Struct or Union has a type of Array but doesn't have a single Array annotation indicating the dimensions of the array.

For more information about FFI, see C interop using dart:ffi.

The following code produces this diagnostic because the field a0 doesn't have an Array annotation:

import 'dart:ffi';

final class C extends Struct {
  external Array<Uint8> a0;
}

Ensure that there's exactly one Array annotation on the field:

import 'dart:ffi';

final class C extends Struct {
  @Array(8)
  external Array<Uint8> a0;
}