Prep to release v0.42.0 (#2003)

* Prep to release v0.42.0

* Remove test_context reference from example

* standalone_crate for doc tests because codegen is expensive

* fmt

subxt/src/book/setup/codegen.rs

@@ -13,7 +13,7 @@
 //! The most common way to generate the interface is to use the [`#[subxt]`](crate::subxt) macro.
 //! Using this macro looks something like:
 //!
-//! ```rust,no_run
+//! ```rust,no_run,standalone_crate
 //! #[subxt::subxt(runtime_metadata_path = "../artifacts/polkadot_metadata_tiny.scale")]
 //! pub mod polkadot {}
 //! ```

subxt/src/book/setup/config.rs

@@ -96,7 +96,7 @@
 //! For statemint, the transaction extensions look like
 //! [this](https://github.com/paritytech/cumulus/blob/d4bb2215bb28ee05159c4c7df1b3435177b5bf4e/parachains/runtimes/assets/asset-hub-polkadot/src/lib.rs#L786):
 //!
-//! ```rs
+//! ```rust,ignore
 //! pub type SignedExtra = (
 //!     frame_system::CheckNonZeroSender<Runtime>,
 //!     frame_system::CheckSpecVersion<Runtime>,

subxt/src/book/usage/constants.rs

@@ -15,7 +15,7 @@
 //!
 //! We can use the statically generated interface to build constant queries:
 //!
-//! ```rust,no_run
+//! ```rust,no_run,standalone_crate
 //! #[subxt::subxt(runtime_metadata_path = "../artifacts/polkadot_metadata_full.scale")]
 //! pub mod polkadot {}
 //!
@@ -24,7 +24,7 @@
 //!
 //! Alternately, we can dynamically construct a constant query:
 //!
-//! ```rust,no_run
+//! ```rust,no_run,standalone_crate
 //! use subxt::dynamic::Value;
 //!
 //! let storage_query = subxt::dynamic::constant("System", "BlockLength");

subxt/src/book/usage/events.rs

@@ -18,7 +18,7 @@
 //! by that transaction being executed. We can also access _all_ of the events produced in a single block using one
 //! of these two interfaces:
 //!
-//! ```rust,no_run
+//! ```rust,no_run,standalone_crate
 //! # #[tokio::main]
 //! # async fn main() -> Result<(), Box<dyn std::error::Error>> {
 //! use subxt::client::OnlineClient;

subxt/src/book/usage/runtime_apis.rs

@@ -21,7 +21,7 @@
 //!
 //! We can use the statically generated interface to build runtime calls:
 //!
-//! ```rust,no_run
+//! ```rust,no_run,standalone_crate
 //! #[subxt::subxt(runtime_metadata_path = "../artifacts/polkadot_metadata_small.scale")]
 //! pub mod polkadot {}
 //!

subxt/src/book/usage/storage.rs

@@ -15,7 +15,7 @@
 //!
 //! We can use the statically generated interface to build storage queries:
 //!
-//! ```rust,no_run
+//! ```rust,no_run,standalone_crate
 //! use subxt_signer::sr25519::dev;
 //!
 //! #[subxt::subxt(runtime_metadata_path = "../artifacts/polkadot_metadata_small.scale")]
@@ -28,7 +28,7 @@
 //! Alternately, we can dynamically construct a storage query. This will not be type checked or
 //! validated until it's submitted:
 //!
-//! ```rust,no_run
+//! ```rust,no_run,standalone_crate
 //! use subxt_signer::sr25519::dev;
 //! use subxt::dynamic::Value;
 //!
@@ -42,7 +42,7 @@
 //! the map of account information). To do this, suffix `_iter` onto the query constructor (this
 //! will only be available on static constructors when iteration is actually possible):
 //!
-//! ```rust,no_run
+//! ```rust,no_run,standalone_crate
 //! #[subxt::subxt(runtime_metadata_path = "../artifacts/polkadot_metadata_small.scale")]
 //! pub mod polkadot {}
 //!

subxt/src/book/usage/transactions.rs

@@ -25,7 +25,7 @@
 //!
 //! We can use the statically generated interface to build transaction payloads:
 //!
-//! ```rust,no_run
+//! ```rust,no_run,standalone_crate
 //! #[subxt::subxt(runtime_metadata_path = "../artifacts/polkadot_metadata_small.scale")]
 //! pub mod polkadot {}
 //!
@@ -41,7 +41,7 @@
 //! Alternately, we can dynamically construct a transaction payload. This will not be type checked or
 //! validated until it's submitted:
 //!
-//! ```rust,no_run
+//! ```rust,no_run,standalone_crate
 //! use subxt::dynamic::Value;
 //!
 //! let tx_payload = subxt::dynamic::tx("System", "remark", vec![
@@ -79,7 +79,7 @@
 //!
 //! Let's go through how to create a signer using the `subxt_signer` crate:
 //!
-//! ```rust
+//! ```rust,standalone_crate
 //! use subxt::config::PolkadotConfig;
 //! use std::str::FromStr;
 //!
@@ -97,7 +97,7 @@
 //!
 //! After initializing the signer, let's also go through how to create a transaction and sign it:
 //!
-//! ```rust,no_run
+//! ```rust,no_run,standalone_crate
 //! # #[tokio::main]
 //! # async fn main() -> Result<(), Box<dyn std::error::Error>> {
 //! use subxt::client::OnlineClient;