[developer_hub] Defensive Programming in Substrate Reference Document

developer-hub/Cargo.toml

@@ -18,6 +18,9 @@ frame = { path = "../substrate/frame", features = ["runtime", "experimental"] }
 pallet-examples = { path = "../substrate/frame/examples" }
 pallet-default-config-example = { path = "../substrate/frame/examples/default-config" }
 
+# Extra example pallets 
+pallet-referenda = { path = "../substrate/frame/referenda" }
+
 # How we build docs in rust-docs
 simple-mermaid = { git = "https://github.com/kianenigma/simple-mermaid.git", branch = "main" }
 docify = "0.2.6"
@@ -57,6 +60,7 @@ sp-api = { path = "../substrate/primitives/api" }
 sp-core = { path = "../substrate/primitives/core" }
 sp-keyring = { path = "../substrate/primitives/keyring" }
 sp-runtime = { path = "../substrate/primitives/runtime" }
+sp-arithmetic = { path = "../substrate/primitives/arithmetic" }
 
 [dev-dependencies]
 parity-scale-codec = "3.6.5"