test_usage_data/build_common_structs.json

{
  "crate": "build_common",
  "module": "structs",
  "usages": [
    {
      "symbol": "FeatureMatrix",
      "kind": "struct_decl",
      "usage_count": 1,
      "usage_type": "StructDecl",
      "node_type": "Item",
      "user_def_id": "build_common",
      "used_def_id": "FeatureMatrix",
      "user_crate": "build_common",
      "used_crate": null
    }
  ]
}