From 78e957481315efbcb7358d0876a5a30cd511a1fe Mon Sep 17 00:00:00 2001
From: Tadeo Hepperle <62739623+tadeohepperle@users.noreply.github.com>
Date: Wed, 14 Feb 2024 16:02:51 +0100
Subject: [PATCH 1/3] [Fix] Auto-generated PR: delete polkadot binaries from
 working directory. (#1431)

* delete substrate and polkadot binaries

* use nodes should move instead of copy and remove the archive
---
 .github/workflows/actions/use-nodes/action.yml | 9 +++++----
 .github/workflows/update-artifacts.yml         | 3 ---
 2 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/.github/workflows/actions/use-nodes/action.yml b/.github/workflows/actions/use-nodes/action.yml
index b1785f9067..bb2b9723d4 100644
--- a/.github/workflows/actions/use-nodes/action.yml
+++ b/.github/workflows/actions/use-nodes/action.yml
@@ -33,7 +33,8 @@ runs:
         ./substrate-node --version
         ./polkadot --version
         mkdir -p ~/.local/bin
-        cp ./substrate-node ~/.local/bin
-        cp ./polkadot ~/.local/bin
-        cp ./polkadot-execute-worker ~/.local/bin
-        cp ./polkadot-prepare-worker ~/.local/bin
+        mv ./substrate-node ~/.local/bin
+        mv ./polkadot ~/.local/bin
+        mv ./polkadot-execute-worker ~/.local/bin
+        mv ./polkadot-prepare-worker ~/.local/bin
+        rm ./polkadot.tar.gz
diff --git a/.github/workflows/update-artifacts.yml b/.github/workflows/update-artifacts.yml
index 49c2a86d18..491f8d4099 100644
--- a/.github/workflows/update-artifacts.yml
+++ b/.github/workflows/update-artifacts.yml
@@ -41,9 +41,6 @@ jobs:
       - name: Fetch Artifacts
         run: cargo run --bin artifacts
 
-      - name: Delete substrate node binary
-        run: rm ./substrate-node
-
       - uses: actions/create-github-app-token@v1
         id: app-token
         with:

From e39791a5bc42aeb192cdd38d08ebf57569566c4b Mon Sep 17 00:00:00 2001
From: Tadeo Hepperle <62739623+tadeohepperle@users.noreply.github.com>
Date: Wed, 14 Feb 2024 17:17:08 +0100
Subject: [PATCH 2/3] Add missing codegen mod in integration tests (#1418)

* add codgen mod to the module tree

* port codegen tests to scale-typegen

* remove test flag
---
 .../src/full_client/codegen/codegen_tests.rs  | 214 ------------------
 .../src/full_client/codegen/documentation.rs  |   2 +-
 .../src/full_client/codegen/mod.rs            |   1 -
 .../integration-tests/src/full_client/mod.rs  |   7 +-
 4 files changed, 2 insertions(+), 222 deletions(-)
 delete mode 100644 testing/integration-tests/src/full_client/codegen/codegen_tests.rs

diff --git a/testing/integration-tests/src/full_client/codegen/codegen_tests.rs b/testing/integration-tests/src/full_client/codegen/codegen_tests.rs
deleted file mode 100644
index 5722270e24..0000000000
--- a/testing/integration-tests/src/full_client/codegen/codegen_tests.rs
+++ /dev/null
@@ -1,214 +0,0 @@
-// Copyright 2019-2023 Parity Technologies (UK) Ltd.
-// This file is dual-licensed as Apache-2.0 or GPL-3.0.
-// see LICENSE for license details.
-
-use frame_metadata::{
-    v15::{ExtrinsicMetadata, RuntimeMetadataV15},
-    RuntimeMetadataPrefixed,
-};
-use scale_info::{meta_type, IntoPortable, PortableRegistry, Registry, TypeInfo};
-use subxt_codegen::CodegenBuilder;
-use syn::__private::quote;
-
-fn generate_runtime_interface_from_metadata(metadata: RuntimeMetadataPrefixed) -> String {
-    // Generate a runtime interface from the provided metadata.
-    let metadata = metadata
-        .try_into()
-        .expect("frame_metadata should be convertible into Metadata");
-
-    CodegenBuilder::new()
-        .no_docs()
-        .generate(metadata)
-        .expect("API generation must be valid")
-        .to_string()
-}
-
-fn generate_runtime_interface_with_type_registry<F>(f: F) -> String
-where
-    F: Fn(&mut scale_info::Registry),
-{
-    #[derive(TypeInfo)]
-    struct Runtime;
-    #[derive(TypeInfo)]
-    enum RuntimeCall {}
-    #[derive(TypeInfo)]
-    enum RuntimeEvent {}
-    #[derive(TypeInfo)]
-    pub enum DispatchError {}
-
-    // We need these types for codegen to work:
-    let mut registry = scale_info::Registry::new();
-    let ty = registry.register_type(&meta_type::<Runtime>());
-    registry.register_type(&meta_type::<RuntimeCall>());
-    registry.register_type(&meta_type::<RuntimeEvent>());
-    registry.register_type(&meta_type::<DispatchError>());
-
-    // Allow custom types to be added for testing:
-    f(&mut registry);
-
-    let extrinsic = ExtrinsicMetadata {
-        ty: meta_type::<()>(),
-        version: 0,
-        signed_extensions: vec![],
-    }
-    .into_portable(&mut registry);
-    let metadata = RuntimeMetadataV15 {
-        types: registry.into(),
-        pallets: Vec::new(),
-        extrinsic,
-        ty,
-        apis: vec![],
-    };
-
-    let metadata = RuntimeMetadataPrefixed::from(metadata);
-    generate_runtime_interface_from_metadata(metadata)
-}
-
-#[test]
-fn dupe_types_do_not_overwrite_each_other() {
-    let interface = generate_runtime_interface_with_type_registry(|registry| {
-        // Now we duplicate some types with same type info. We need two unique types here,
-        // and can't just add one type to the registry twice, because the registry knows if
-        // type IDs are the same.
-        enum Foo {}
-        impl TypeInfo for Foo {
-            type Identity = Self;
-            fn type_info() -> scale_info::Type {
-                scale_info::Type::builder()
-                    .path(scale_info::Path::new("DuplicateType", "dupe_mod"))
-                    .variant(
-                        scale_info::build::Variants::new()
-                            .variant("FirstDupeTypeVariant", |builder| builder.index(0)),
-                    )
-            }
-        }
-        enum Bar {}
-        impl TypeInfo for Bar {
-            type Identity = Self;
-            fn type_info() -> scale_info::Type {
-                scale_info::Type::builder()
-                    .path(scale_info::Path::new("DuplicateType", "dupe_mod"))
-                    .variant(
-                        scale_info::build::Variants::new()
-                            .variant("SecondDupeTypeVariant", |builder| builder.index(0)),
-                    )
-            }
-        }
-
-        registry.register_type(&meta_type::<Foo>());
-        registry.register_type(&meta_type::<Bar>());
-    });
-
-    assert!(interface.contains("DuplicateType"));
-    assert!(interface.contains("FirstDupeTypeVariant"));
-
-    assert!(interface.contains("DuplicateType2"));
-    assert!(interface.contains("SecondDupeTypeVariant"));
-}
-
-#[test]
-fn generic_types_overwrite_each_other() {
-    let interface = generate_runtime_interface_with_type_registry(|registry| {
-        // If we have two types mentioned in the registry that have generic params,
-        // only one type will be output (the codegen assumes that the generic param will disambiguate)
-        enum Foo {}
-        impl TypeInfo for Foo {
-            type Identity = Self;
-            fn type_info() -> scale_info::Type {
-                scale_info::Type::builder()
-                    .path(scale_info::Path::new("DuplicateType", "dupe_mod"))
-                    .type_params([scale_info::TypeParameter::new("T", Some(meta_type::<u8>()))])
-                    .variant(scale_info::build::Variants::new())
-            }
-        }
-        enum Bar {}
-        impl TypeInfo for Bar {
-            type Identity = Self;
-            fn type_info() -> scale_info::Type {
-                scale_info::Type::builder()
-                    .path(scale_info::Path::new("DuplicateType", "dupe_mod"))
-                    .type_params([scale_info::TypeParameter::new("T", Some(meta_type::<u8>()))])
-                    .variant(scale_info::build::Variants::new())
-            }
-        }
-
-        registry.register_type(&meta_type::<Foo>());
-        registry.register_type(&meta_type::<Bar>());
-    });
-
-    assert!(interface.contains("DuplicateType"));
-    // We do _not_ expect this to exist, since a generic is present on the type:
-    assert!(!interface.contains("DuplicateType2"));
-}
-
-#[test]
-fn more_than_1_generic_parameters_work() {
-    #[allow(unused)]
-    #[derive(TypeInfo)]
-    struct Foo<T, U, V, W> {
-        a: T,
-        b: U,
-        c: V,
-        d: W,
-    }
-
-    #[allow(unused)]
-    #[derive(TypeInfo)]
-    struct Bar {
-        p: Foo<u32, u32, u64, u128>,
-        q: Foo<u8, u8, u8, u8>,
-    }
-
-    let mut registry = Registry::new();
-    registry.register_type(&meta_type::<Bar>());
-    let portable_types: PortableRegistry = registry.into();
-
-    let type_gen = subxt_codegen::TypeGenerator::new(
-        &portable_types,
-        "root",
-        Default::default(),
-        Default::default(),
-        CratePath::default(),
-        false,
-    );
-
-    let types = type_gen.generate_types_mod().unwrap();
-    let generated_mod = quote::quote!( #types);
-
-    let expected_mod = quote::quote! {
-    pub mod root {
-        use super::root;
-        pub mod integration_tests {
-            use super::root;
-            pub mod codegen {
-            use super::root;
-                pub mod codegen_tests {
-                        use super::root;
-                        pub struct Bar {
-                            pub p: root::integration_tests::codegen::codegen_tests::Foo<
-                                ::core::primitive::u32,
-                                ::core::primitive::u32,
-                                ::core::primitive::u64,
-                                ::core::primitive::u128
-                            >,
-                            pub q: root::integration_tests::codegen::codegen_tests::Foo<
-                                ::core::primitive::u8,
-                                ::core::primitive::u8,
-                                ::core::primitive::u8,
-                                ::core::primitive::u8
-                            >,
-                        }
-                        pub struct Foo<_0, _1, _2, _3> {
-                            pub a: _0,
-                            pub b: _1,
-                            pub c: _2,
-                            pub d: _3,
-                        }
-                    }
-                }
-            }
-        }
-    };
-
-    assert_eq!(generated_mod.to_string(), expected_mod.to_string());
-}
diff --git a/testing/integration-tests/src/full_client/codegen/documentation.rs b/testing/integration-tests/src/full_client/codegen/documentation.rs
index 8eead47760..fea4e78f64 100644
--- a/testing/integration-tests/src/full_client/codegen/documentation.rs
+++ b/testing/integration-tests/src/full_client/codegen/documentation.rs
@@ -4,7 +4,7 @@
 
 use codec::Decode;
 use regex::Regex;
-use subxt_codegen::{ syn, CodegenBuilder };
+use subxt_codegen::{syn, CodegenBuilder};
 use subxt_metadata::Metadata;
 
 fn load_test_metadata() -> Metadata {
diff --git a/testing/integration-tests/src/full_client/codegen/mod.rs b/testing/integration-tests/src/full_client/codegen/mod.rs
index f2b3a97658..e17b92a0b7 100644
--- a/testing/integration-tests/src/full_client/codegen/mod.rs
+++ b/testing/integration-tests/src/full_client/codegen/mod.rs
@@ -14,5 +14,4 @@
 #[allow(clippy::all)]
 mod polkadot;
 
-mod codegen_tests;
 mod documentation;
diff --git a/testing/integration-tests/src/full_client/mod.rs b/testing/integration-tests/src/full_client/mod.rs
index 5b496ccea3..f5e0a72510 100644
--- a/testing/integration-tests/src/full_client/mod.rs
+++ b/testing/integration-tests/src/full_client/mod.rs
@@ -2,15 +2,10 @@
 // This file is dual-licensed as Apache-2.0 or GPL-3.0.
 // see LICENSE for license details.
 
-#[cfg(test)]
 mod blocks;
-#[cfg(test)]
 mod client;
-#[cfg(test)]
+mod codegen;
 mod frame;
-#[cfg(test)]
 mod metadata;
-#[cfg(test)]
 mod runtime_api;
-#[cfg(test)]
 mod storage;

From 54470357165c08fd703373678f38dcc633465cec Mon Sep 17 00:00:00 2001
From: Tadeo Hepperle <62739623+tadeohepperle@users.noreply.github.com>
Date: Thu, 15 Feb 2024 10:49:15 +0100
Subject: [PATCH 3/3] Subxt Metadata: `#[no_std]` compatibility (#1401)

* no-std tests and porting of subxt-metadata

* update pipeline

* fix generate custom metadata test

* fix cargo run command

* adjust pipeline

* remove prelude from subxt-metadata

* revert autoformatting of Cargo.toml

* remove alloc::format! again, still causes linker errors

* add no-std-build for thumbv7em-none-eabi target

* remove std feature flag

* remove libc and add small readme with test instructions

* change ci for nightly no std
---
 .github/workflows/rust.yml                    |  34 ++
 Cargo.lock                                    | 287 ++++++-----
 Cargo.toml                                    |  10 +-
 metadata/Cargo.toml                           |  13 +-
 metadata/src/from_into/mod.rs                 |  18 +-
 metadata/src/from_into/v14.rs                 |  31 +-
 metadata/src/from_into/v15.rs                 |   4 +-
 metadata/src/lib.rs                           |  11 +-
 metadata/src/utils/ordered_map.rs             |  16 +-
 metadata/src/utils/retain.rs                  |   3 +-
 metadata/src/utils/validation.rs              |   3 +-
 .../src/utils/validation/outer_enum_hashes.rs |   2 +-
 metadata/src/utils/variant_index.rs           |   8 +-
 subxt/Cargo.toml                              |  16 +-
 testing/generate-custom-metadata/Cargo.toml   |   6 +-
 testing/no-std-tests/.gitignore               |   1 +
 testing/no-std-tests/Cargo.lock               | 487 ++++++++++++++++++
 testing/no-std-tests/Cargo.toml               |  21 +
 testing/no-std-tests/README.md                |   7 +
 testing/no-std-tests/rust-toolchain           |   1 +
 testing/no-std-tests/src/main.rs              |  47 ++
 21 files changed, 851 insertions(+), 175 deletions(-)
 create mode 100644 testing/no-std-tests/.gitignore
 create mode 100644 testing/no-std-tests/Cargo.lock
 create mode 100644 testing/no-std-tests/Cargo.toml
 create mode 100644 testing/no-std-tests/README.md
 create mode 100644 testing/no-std-tests/rust-toolchain
 create mode 100644 testing/no-std-tests/src/main.rs

diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index ac5c82e3e4..327a77bd31 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -419,3 +419,37 @@ jobs:
 
       - if: "failure()"
         uses: "andymckay/cancel-action@271cfbfa11ca9222f7be99a47e8f929574549e0a" # v0.4
+
+  no-std-tests:
+    name: "Test (no_std)"
+    runs-on: ubuntu-latest
+    needs: [machete, docs]
+    timeout-minutes: 30
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+
+      # Note: needs nighly toolchain because otherwise we cannot define custom lang-items.
+      - name: Install Rust nightly toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly
+          override: true
+          target: thumbv7em-none-eabi
+
+      - name: Install the gcc-arm-none-eabi linker
+        run: sudo apt install gcc-arm-none-eabi
+
+      - name: Rust Cache
+        uses: Swatinem/rust-cache@23bce251a8cd2ffc3c1075eaa2367cf899916d84 # v2.7.3
+
+      # Note: We currently do not have a way to run real tests in a `no_std` environment.
+      # We can only make sure that they compile to ARM thumb ISA.
+      # Running the binary and inspecting the output would require an actual machine with matching ISA or some sort of emulator.
+      - name: Compile `no-std-tests` crate to `thumbv7em-none-eabi` target.
+        run: cargo build --target thumbv7em-none-eabi
+        working-directory: testing/no-std-tests
+
+      - if: "failure()"
+        uses: "andymckay/cancel-action@271cfbfa11ca9222f7be99a47e8f929574549e0a" # v0.4
diff --git a/Cargo.lock b/Cargo.lock
index f082ecbe3d..6fe5bf2575 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -48,9 +48,9 @@ dependencies = [
 
 [[package]]
 name = "ahash"
-version = "0.7.7"
+version = "0.7.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a824f2aa7e75a0c98c5a504fceb80649e9c35265d44525b5f94de4771a395cd"
+checksum = "891477e0c6a8957309ee5c45a6368af3ae14bb510732d2684ffa19af310920f9"
 dependencies = [
  "getrandom",
  "once_cell",
@@ -59,9 +59,9 @@ dependencies = [
 
 [[package]]
 name = "ahash"
-version = "0.8.7"
+version = "0.8.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "77c3a9648d43b9cd48db467b3f87fdd6e146bcc88ab0180006cef2179fe11d01"
+checksum = "42cd52102d3df161c77a887b608d7a4897d7cc112886a9537b738a887a03aaff"
 dependencies = [
  "cfg-if",
  "getrandom",
@@ -131,9 +131,9 @@ dependencies = [
 
 [[package]]
 name = "anstyle"
-version = "1.0.4"
+version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7079075b41f533b8c61d2a4d073c4676e1f8b249ff94a393b0595db304e0dd87"
+checksum = "8901269c6307e8d93993578286ac0edf7f195079ffff5ebdeea6a59ffb7e36bc"
 
 [[package]]
 name = "anstyle-parse"
@@ -346,13 +346,13 @@ checksum = "9b34d609dfbaf33d6889b2b7106d3ca345eacad44200913df5ba02bfd31d2ba9"
 
 [[package]]
 name = "async-channel"
-version = "2.1.1"
+version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1ca33f4bc4ed1babef42cad36cc1f51fa88be00420404e5b1e80ab1b18f7678c"
+checksum = "f28243a43d821d11341ab73c80bed182dc015c514b951616cf79bd4af39af0c3"
 dependencies = [
  "concurrent-queue",
- "event-listener 4.0.3",
- "event-listener-strategy",
+ "event-listener 5.0.0",
+ "event-listener-strategy 0.5.0",
  "futures-core",
  "pin-project-lite",
 ]
@@ -373,9 +373,9 @@ dependencies = [
 
 [[package]]
 name = "async-fs"
-version = "2.1.0"
+version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd1f344136bad34df1f83a47f3fd7f2ab85d75cb8a940af4ccf6d482a84ea01b"
+checksum = "bc19683171f287921f2405677dd2ed2549c3b3bda697a563ebc3a121ace2aba1"
 dependencies = [
  "async-lock 3.3.0",
  "blocking",
@@ -384,9 +384,9 @@ dependencies = [
 
 [[package]]
 name = "async-io"
-version = "2.3.0"
+version = "2.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fb41eb19024a91746eba0773aa5e16036045bbf45733766661099e182ea6a744"
+checksum = "8f97ab0c5b00a7cdbe5a371b9a782ee7be1316095885c8a4ea1daf490eb0ef65"
 dependencies = [
  "async-lock 3.3.0",
  "cfg-if",
@@ -395,7 +395,7 @@ dependencies = [
  "futures-lite",
  "parking",
  "polling",
- "rustix 0.38.30",
+ "rustix 0.38.31",
  "slab",
  "tracing",
  "windows-sys 0.52.0",
@@ -417,7 +417,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d034b430882f8381900d3fe6f0aaa3ad94f2cb4ac519b429692a1bc2dda4ae7b"
 dependencies = [
  "event-listener 4.0.3",
- "event-listener-strategy",
+ "event-listener-strategy 0.4.0",
  "pin-project-lite",
 ]
 
@@ -446,7 +446,7 @@ dependencies = [
  "cfg-if",
  "event-listener 4.0.3",
  "futures-lite",
- "rustix 0.38.30",
+ "rustix 0.38.31",
  "windows-sys 0.52.0",
 ]
 
@@ -462,7 +462,7 @@ dependencies = [
  "cfg-if",
  "futures-core",
  "futures-io",
- "rustix 0.38.30",
+ "rustix 0.38.31",
  "signal-hook-registry",
  "slab",
  "windows-sys 0.48.0",
@@ -793,9 +793,9 @@ dependencies = [
 
 [[package]]
 name = "chrono"
-version = "0.4.32"
+version = "0.4.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "41daef31d7a747c5c847246f36de49ced6f7403b4cdabc807a97b5cc184cda7a"
+checksum = "5bc015644b92d5890fab7489e49d21f879d5c990186827d42ec511919404f38b"
 dependencies = [
  "android-tzdata",
  "iana-time-zone",
@@ -805,9 +805,9 @@ dependencies = [
 
 [[package]]
 name = "ciborium"
-version = "0.2.1"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "effd91f6c78e5a4ace8a5d3c0b6bfaec9e2baaef55f3efc00e45fb2e477ee926"
+checksum = "42e69ffd6f0917f5c029256a24d0161db17cea3997d185db0d35926308770f0e"
 dependencies = [
  "ciborium-io",
  "ciborium-ll",
@@ -816,15 +816,15 @@ dependencies = [
 
 [[package]]
 name = "ciborium-io"
-version = "0.2.1"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cdf919175532b369853f5d5e20b26b43112613fd6fe7aee757e35f7a44642656"
+checksum = "05afea1e0a06c9be33d539b876f1ce3692f4afea2cb41f740e7743225ed1c757"
 
 [[package]]
 name = "ciborium-ll"
-version = "0.2.1"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "defaa24ecc093c77630e6c15e17c51f5e187bf35ee514f4e2d67baaa96dae22b"
+checksum = "57663b653d948a338bfb3eeba9bb2fd5fcfaecb9e199e87e1eda4d9e8b240fd9"
 dependencies = [
  "ciborium-io",
  "half",
@@ -1033,9 +1033,9 @@ dependencies = [
 
 [[package]]
 name = "crc32fast"
-version = "1.3.2"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b540bd8bc810d3885c6ea91e2018302f68baba2129ab3e88f32389ee9370880d"
+checksum = "b3855a8a784b474f333699ef2bbca9db2c4a1f6d9088a90a2d25b1eb53111eaa"
 dependencies = [
  "cfg-if",
 ]
@@ -1175,9 +1175,9 @@ dependencies = [
 
 [[package]]
 name = "curve25519-dalek"
-version = "4.1.1"
+version = "4.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e89b8c6a2e4b1f45971ad09761aafb85514a84744b67a95e32c3cc1352d1f65c"
+checksum = "0a677b8922c94e01bdbb12126b0bc852f00447528dee1782229af9c720c3f348"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -1213,12 +1213,12 @@ dependencies = [
 
 [[package]]
 name = "darling"
-version = "0.20.5"
+version = "0.20.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fc5d6b04b3fd0ba9926f945895de7d806260a2d7431ba82e7edaecb043c4c6b8"
+checksum = "c376d08ea6aa96aafe61237c7200d1241cb177b7d3a542d791f2d118e9cbb955"
 dependencies = [
- "darling_core 0.20.5",
- "darling_macro 0.20.5",
+ "darling_core 0.20.6",
+ "darling_macro 0.20.6",
 ]
 
 [[package]]
@@ -1237,9 +1237,9 @@ dependencies = [
 
 [[package]]
 name = "darling_core"
-version = "0.20.5"
+version = "0.20.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "04e48a959bcd5c761246f5d090ebc2fbf7b9cd527a492b07a67510c108f1e7e3"
+checksum = "33043dcd19068b8192064c704b3f83eb464f91f1ff527b44a4e2b08d9cdb8855"
 dependencies = [
  "fnv",
  "ident_case",
@@ -1262,11 +1262,11 @@ dependencies = [
 
 [[package]]
 name = "darling_macro"
-version = "0.20.5"
+version = "0.20.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1d1545d67a2149e1d93b7e5c7752dce5a7426eb5d1357ddcfd89336b94444f77"
+checksum = "c5a91391accf613803c2a9bf9abccdbaa07c54b4244a5b64883f9c3c137c86be"
 dependencies = [
- "darling_core 0.20.5",
+ "darling_core 0.20.6",
  "quote",
  "syn 2.0.48",
 ]
@@ -1423,11 +1423,11 @@ dependencies = [
 
 [[package]]
 name = "ed25519-dalek"
-version = "2.1.0"
+version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1f628eaec48bfd21b865dc2950cfa014450c01d2fa2b69a86c2fd5844ec523c0"
+checksum = "4a3daa8e81a3963a60642bcc1f90a670680bd4a77535faa384e9d1c79d620871"
 dependencies = [
- "curve25519-dalek 4.1.1",
+ "curve25519-dalek 4.1.2",
  "ed25519",
  "serde",
  "sha2 0.10.8",
@@ -1455,7 +1455,7 @@ version = "4.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7d9ce6874da5d4415896cd45ffbc4d1cfc0c4f9c079427bd870742c30f2f65a9"
 dependencies = [
- "curve25519-dalek 4.1.1",
+ "curve25519-dalek 4.1.2",
  "ed25519",
  "hashbrown 0.14.3",
  "hex",
@@ -1509,6 +1509,17 @@ dependencies = [
  "pin-project-lite",
 ]
 
+[[package]]
+name = "event-listener"
+version = "5.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b72557800024fabbaa2449dd4bf24e37b93702d457a4d4f2b0dd1f0f039f20c1"
+dependencies = [
+ "concurrent-queue",
+ "parking",
+ "pin-project-lite",
+]
+
 [[package]]
 name = "event-listener-strategy"
 version = "0.4.0"
@@ -1519,6 +1530,16 @@ dependencies = [
  "pin-project-lite",
 ]
 
+[[package]]
+name = "event-listener-strategy"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "feedafcaa9b749175d5ac357452a9d41ea2911da598fde46ce1fe02c37751291"
+dependencies = [
+ "event-listener 5.0.0",
+ "pin-project-lite",
+]
+
 [[package]]
 name = "expander"
 version = "2.0.0"
@@ -1534,9 +1555,9 @@ dependencies = [
 
 [[package]]
 name = "eyre"
-version = "0.6.11"
+version = "0.6.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b6267a1fa6f59179ea4afc8e50fd8612a3cc60bc858f786ff877a4a8cb042799"
+checksum = "7cd915d99f24784cdc19fd37ef22b97e3ff0ae756c7e492e9fbfe897d61e2aec"
 dependencies = [
  "indenter",
  "once_cell",
@@ -1562,9 +1583,9 @@ checksum = "25cbce373ec4653f1a01a31e8a5e5ec0c622dc27ff9c4e6606eefef5cbbed4a5"
 
 [[package]]
 name = "fiat-crypto"
-version = "0.2.5"
+version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "27573eac26f4dd11e2b1916c3fe1baa56407c83c71a773a8ba17ec0bca03b6b7"
+checksum = "1676f435fc1dadde4d03e43f5d62b259e1ce5f40bd4ffb21db2b42ebe59c1382"
 
 [[package]]
 name = "fixed-hash"
@@ -1882,7 +1903,7 @@ dependencies = [
  "futures-sink",
  "futures-util",
  "http",
- "indexmap 2.1.0",
+ "indexmap 2.2.3",
  "slab",
  "tokio",
  "tokio-util",
@@ -1891,9 +1912,13 @@ dependencies = [
 
 [[package]]
 name = "half"
-version = "1.8.2"
+version = "2.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eabb4a44450da02c90444cf74558da904edde8fb4e9035a9a6a4e15445af0bd7"
+checksum = "bc52e53916c08643f1b56ec082790d1e86a32e58dc5268f897f313fbae7b4872"
+dependencies = [
+ "cfg-if",
+ "crunchy",
+]
 
 [[package]]
 name = "hash-db"
@@ -1916,7 +1941,7 @@ version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
 dependencies = [
- "ahash 0.7.7",
+ "ahash 0.7.8",
 ]
 
 [[package]]
@@ -1925,7 +1950,7 @@ version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "43a3c133739dddd0d2990f9a4bdf8eb4b21ef50e4851ca85ab661199821d510e"
 dependencies = [
- "ahash 0.8.7",
+ "ahash 0.8.8",
 ]
 
 [[package]]
@@ -1934,7 +1959,7 @@ version = "0.14.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "290f1a1d9242c78d09ce40a5e87e7554ee637af1351968159f4952f028f75604"
 dependencies = [
- "ahash 0.8.7",
+ "ahash 0.8.8",
  "allocator-api2",
  "serde",
 ]
@@ -1956,9 +1981,9 @@ dependencies = [
 
 [[package]]
 name = "hermit-abi"
-version = "0.3.4"
+version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5d3d0e0f38255e7fa3cf31335b3a56f05febd18025f4db5ef7a0cfb4f8da651f"
+checksum = "bd5256b483761cd23699d0da46cc6fd2ee3be420bbe6d020ae4a091e70b7e9fd"
 
 [[package]]
 name = "hex"
@@ -2091,9 +2116,9 @@ dependencies = [
 
 [[package]]
 name = "iana-time-zone"
-version = "0.1.59"
+version = "0.1.60"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b6a67363e2aa4443928ce15e57ebae94fd8949958fd1223c4cfc0cd473ad7539"
+checksum = "e7ffbb5a1b541ea2561f8c41c087286cc091e21e556a4f09a8f6cbf17b69b141"
 dependencies = [
  "android_system_properties",
  "core-foundation-sys",
@@ -2176,9 +2201,9 @@ dependencies = [
 
 [[package]]
 name = "indexmap"
-version = "2.1.0"
+version = "2.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d530e1a18b1cb4c484e6e34556a0d948706958449fca0cab753d649f2bce3d1f"
+checksum = "233cf39063f058ea2caae4091bf4a3ef70a653afbc026f5c4a4135d114e3c177"
 dependencies = [
  "equivalent",
  "hashbrown 0.14.3",
@@ -2258,7 +2283,7 @@ version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "eae7b9aee968036d54dce06cebaefd919e4472e753296daccd6d344e3e2df0c2"
 dependencies = [
- "hermit-abi 0.3.4",
+ "hermit-abi 0.3.6",
  "libc",
  "windows-sys 0.48.0",
 ]
@@ -2274,9 +2299,9 @@ dependencies = [
 
 [[package]]
 name = "itertools"
-version = "0.12.0"
+version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "25db6b064527c5d482d0423354fcd07a89a2dfe07b67892e62411946db7f07b0"
+checksum = "ba291022dbbd398a455acf126c1e341954079855bc60dfdda641363bd6922569"
 dependencies = [
  "either",
 ]
@@ -2420,9 +2445,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.152"
+version = "0.2.153"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "13e3bf6590cbc649f4d1a3eefc9d5d6eb746f5200ffb04e5e142700b8faa56e7"
+checksum = "9c198f91728a82281a64e1f4f9eeb25d82cb32a5de251c6bd1b5154d63a8e7bd"
 
 [[package]]
 name = "libm"
@@ -2508,9 +2533,9 @@ checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
 
 [[package]]
 name = "lru"
-version = "0.12.1"
+version = "0.12.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2994eeba8ed550fd9b47a0b38f0242bc3344e496483c6180b69139cc2fa5d1d7"
+checksum = "db2c024b41519440580066ba82aab04092b333e09066a5eb86c7c4890df31f22"
 dependencies = [
  "hashbrown 0.14.3",
 ]
@@ -2545,7 +2570,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b2cffa4ad52c6f791f4f8b15f0c05f9824b2ced1160e88cc393d64fff9a8ac64"
 dependencies = [
- "rustix 0.38.30",
+ "rustix 0.38.31",
 ]
 
 [[package]]
@@ -2598,9 +2623,9 @@ checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
 
 [[package]]
 name = "miniz_oxide"
-version = "0.7.1"
+version = "0.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e7810e0be55b428ada41041c41f32c9f1a42817901b4ccf45fa3d4b6561e74c7"
+checksum = "9d811f3e15f28568be3407c8e7fdb6514c1cda3cb30683f15b6a1a1dc4ea14a7"
 dependencies = [
  "adler",
 ]
@@ -2677,11 +2702,10 @@ dependencies = [
 
 [[package]]
 name = "num-integer"
-version = "0.1.45"
+version = "0.1.46"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "225d3389fb3509a24c93f5c29eb6bde2586b98d9f016636dff58d7c6f7569cd9"
+checksum = "7969661fd2958a5cb096e56c8e1ad0444ac2bbcd0061bd28660485a44879858f"
 dependencies = [
- "autocfg",
  "num-traits",
 ]
 
@@ -2699,9 +2723,9 @@ dependencies = [
 
 [[package]]
 name = "num-traits"
-version = "0.2.17"
+version = "0.2.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39e3200413f237f41ab11ad6d161bc7239c84dcb631773ccd7de3dfe4b5c267c"
+checksum = "da0df0e5185db44f69b44f26786fe401b6c293d1907744beaa7fa62b2e5a517a"
 dependencies = [
  "autocfg",
 ]
@@ -2712,7 +2736,7 @@ version = "1.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4161fcb6d602d4d2081af7c3a45852d875a03dd337a6bfdd6e06407b61342a43"
 dependencies = [
- "hermit-abi 0.3.4",
+ "hermit-abi 0.3.6",
  "libc",
 ]
 
@@ -2966,14 +2990,14 @@ dependencies = [
 
 [[package]]
 name = "polling"
-version = "3.3.2"
+version = "3.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "545c980a3880efd47b2e262f6a4bb6daad6555cf3367aa9c4e52895f69537a41"
+checksum = "30054e72317ab98eddd8561db0f6524df3367636884b7b21b703e4b280a84a14"
 dependencies = [
  "cfg-if",
  "concurrent-queue",
  "pin-project-lite",
- "rustix 0.38.30",
+ "rustix 0.38.31",
  "tracing",
  "windows-sys 0.52.0",
 ]
@@ -3043,7 +3067,7 @@ version = "3.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6d37c51ca738a55da99dc0c4a34860fd675453b8b36209178c2249bb13651284"
 dependencies = [
- "toml_edit 0.21.0",
+ "toml_edit 0.21.1",
 ]
 
 [[package]]
@@ -3212,7 +3236,7 @@ checksum = "b62dbe01f0b06f9d8dc7d49e05a0785f153b00b2c227856282f671e0318c9b15"
 dependencies = [
  "aho-corasick",
  "memchr",
- "regex-automata 0.4.4",
+ "regex-automata 0.4.5",
  "regex-syntax 0.8.2",
 ]
 
@@ -3227,9 +3251,9 @@ dependencies = [
 
 [[package]]
 name = "regex-automata"
-version = "0.4.4"
+version = "0.4.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3b7fa1134405e2ec9353fd416b17f8dacd46c473d7d3fd1cf202706a14eb792a"
+checksum = "5bb987efffd3c6d0d8f5f89510bb458559eab11e4f869acb20bf845e016259cd"
 dependencies = [
  "aho-corasick",
  "memchr",
@@ -3305,9 +3329,9 @@ dependencies = [
 
 [[package]]
 name = "rustix"
-version = "0.38.30"
+version = "0.38.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "322394588aaf33c24007e8bb3238ee3e4c5c09c084ab32bc73890b99ff326bca"
+checksum = "6ea3e1a662af26cd7a3ba09c0297a31af215563ecf42817c98df621387f4e949"
 dependencies = [
  "bitflags 2.4.2",
  "errno",
@@ -3337,7 +3361,7 @@ dependencies = [
  "log",
  "ring",
  "rustls-pki-types",
- "rustls-webpki 0.102.1",
+ "rustls-webpki 0.102.2",
  "subtle",
  "zeroize",
 ]
@@ -3388,9 +3412,9 @@ dependencies = [
 
 [[package]]
 name = "rustls-pki-types"
-version = "1.1.0"
+version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9e9d979b3ce68192e42760c7810125eb6cf2ea10efae545a156063e61f314e2a"
+checksum = "048a63e5b3ac996d78d402940b5fa47973d2d080c6c6fffa1d0f19c4445310b7"
 
 [[package]]
 name = "rustls-webpki"
@@ -3404,9 +3428,9 @@ dependencies = [
 
 [[package]]
 name = "rustls-webpki"
-version = "0.102.1"
+version = "0.102.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef4ca26037c909dedb327b48c3327d0ba91d3dd3c4e05dad328f210ffb68e95b"
+checksum = "faaa0a62740bedb9b2ef5afa303da42764c012f743917351dc9a237ea1663610"
 dependencies = [
  "ring",
  "rustls-pki-types",
@@ -3604,7 +3628,7 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "772575a524feeb803e5b0fcbc6dd9f367e579488197c94c6e4023aad2305774d"
 dependencies = [
- "ahash 0.8.7",
+ "ahash 0.8.8",
  "cfg-if",
  "hashbrown 0.13.2",
 ]
@@ -3634,7 +3658,7 @@ dependencies = [
  "aead",
  "arrayref",
  "arrayvec 0.7.4",
- "curve25519-dalek 4.1.1",
+ "curve25519-dalek 4.1.2",
  "getrandom_or_panic",
  "merlin 3.0.0",
  "rand_core 0.6.4",
@@ -3932,7 +3956,7 @@ dependencies = [
  "hashbrown 0.14.3",
  "hex",
  "hmac 0.12.1",
- "itertools 0.12.0",
+ "itertools 0.12.1",
  "libm",
  "libsecp256k1",
  "merlin 3.0.0",
@@ -3981,7 +4005,7 @@ dependencies = [
  "futures-util",
  "hashbrown 0.14.3",
  "hex",
- "itertools 0.12.0",
+ "itertools 0.12.1",
  "log",
  "lru",
  "no-std-net",
@@ -4314,7 +4338,7 @@ version = "29.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2e4d24d84a0beb44a71dcac1b41980e1edf7fb722c7f3046710136a283cd479b"
 dependencies = [
- "ahash 0.8.7",
+ "ahash 0.8.8",
  "hash-db",
  "lazy_static",
  "memory-db",
@@ -4596,7 +4620,7 @@ dependencies = [
 name = "subxt-macro"
 version = "0.34.0"
 dependencies = [
- "darling 0.20.5",
+ "darling 0.20.6",
  "parity-scale-codec",
  "proc-macro-error",
  "quote",
@@ -4612,11 +4636,12 @@ dependencies = [
  "assert_matches",
  "bitvec",
  "criterion",
+ "derive_more",
  "frame-metadata 16.0.0",
+ "hashbrown 0.14.3",
  "parity-scale-codec",
  "scale-info",
  "sp-core-hashing",
- "thiserror",
 ]
 
 [[package]]
@@ -4850,14 +4875,14 @@ dependencies = [
 
 [[package]]
 name = "toml"
-version = "0.8.8"
+version = "0.8.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1a195ec8c9da26928f773888e0742ca3ca1040c6cd859c919c9f59c1954ab35"
+checksum = "9a9aad4a3066010876e8dcf5a8a06e70a558751117a145c6ce2b82c2e2054290"
 dependencies = [
  "serde",
  "serde_spanned",
  "toml_datetime",
- "toml_edit 0.21.0",
+ "toml_edit 0.22.5",
 ]
 
 [[package]]
@@ -4875,9 +4900,9 @@ version = "0.19.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1b5bb770da30e5cbfde35a2d7b9b8a2c4b8ef89548a7a6aeab5c9a576e3e7421"
 dependencies = [
- "indexmap 2.1.0",
+ "indexmap 2.2.3",
  "toml_datetime",
- "winnow",
+ "winnow 0.5.40",
 ]
 
 [[package]]
@@ -4886,22 +4911,33 @@ version = "0.20.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "70f427fce4d84c72b5b732388bf4a9f4531b53f74e2887e3ecb2481f68f66d81"
 dependencies = [
- "indexmap 2.1.0",
+ "indexmap 2.2.3",
  "toml_datetime",
- "winnow",
+ "winnow 0.5.40",
 ]
 
 [[package]]
 name = "toml_edit"
-version = "0.21.0"
+version = "0.21.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d34d383cd00a163b4a5b85053df514d45bc330f6de7737edfe0a93311d1eaa03"
+checksum = "6a8534fd7f78b5405e860340ad6575217ce99f38d4d5c8f2442cb5ecb50090e1"
 dependencies = [
- "indexmap 2.1.0",
+ "indexmap 2.2.3",
+ "toml_datetime",
+ "winnow 0.5.40",
+]
+
+[[package]]
+name = "toml_edit"
+version = "0.22.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "99e68c159e8f5ba8a28c4eb7b0c0c190d77bb479047ca713270048145a9ad28a"
+dependencies = [
+ "indexmap 2.2.3",
  "serde",
  "serde_spanned",
  "toml_datetime",
- "winnow",
+ "winnow 0.6.1",
 ]
 
 [[package]]
@@ -5320,9 +5356,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-futures"
-version = "0.4.40"
+version = "0.4.41"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bde2032aeb86bdfaecc8b261eef3cba735cc426c1f3a3416d1e0791be95fc461"
+checksum = "877b9c3f61ceea0e56331985743b13f3d25c406a7098d45180fb5f09bc19ed97"
 dependencies = [
  "cfg-if",
  "js-sys",
@@ -5361,9 +5397,9 @@ checksum = "4f186bd2dcf04330886ce82d6f33dd75a7bfcf69ecf5763b89fcde53b6ac9838"
 
 [[package]]
 name = "wasmi"
-version = "0.31.1"
+version = "0.31.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "acfc1e384a36ca532d070a315925887247f3c7e23567e23e0ac9b1c5d6b8bf76"
+checksum = "77a8281d1d660cdf54c76a3efa9ddd0c270cada1383a995db3ccb43d166456c7"
 dependencies = [
  "smallvec",
  "spin",
@@ -5374,9 +5410,9 @@ dependencies = [
 
 [[package]]
 name = "wasmi_arena"
-version = "0.4.0"
+version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
+checksum = "104a7f73be44570cac297b3035d76b169d6599637631cf37a1703326a0727073"
 
 [[package]]
 name = "wasmi_core"
@@ -5543,9 +5579,9 @@ dependencies = [
 
 [[package]]
 name = "web-sys"
-version = "0.3.67"
+version = "0.3.68"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "58cd2333b6e0be7a39605f0e255892fd7418a682d8da8fe042fe25128794d2ed"
+checksum = "96565907687f7aceb35bc5fc03770a8a0471d82e479f25832f54a0e3f4b28446"
 dependencies = [
  "js-sys",
  "wasm-bindgen",
@@ -5560,7 +5596,7 @@ dependencies = [
  "either",
  "home",
  "once_cell",
- "rustix 0.38.30",
+ "rustix 0.38.31",
  "windows-sys 0.48.0",
 ]
 
@@ -5804,9 +5840,18 @@ checksum = "dff9641d1cd4be8d1a070daf9e3773c5f67e78b4d9d42263020c057706765c04"
 
 [[package]]
 name = "winnow"
-version = "0.5.34"
+version = "0.5.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b7cf47b659b318dccbd69cc4797a39ae128f533dce7902a1096044d1967b9c16"
+checksum = "f593a95398737aeed53e489c785df13f3618e41dbcd6718c6addbf1395aa6876"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "winnow"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d90f4e0f530c4c69f62b80d839e9ef3855edc9cba471a160c4d692deed62b401"
 dependencies = [
  "memchr",
 ]
@@ -5822,11 +5867,11 @@ dependencies = [
 
 [[package]]
 name = "x25519-dalek"
-version = "2.0.0"
+version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fb66477291e7e8d2b0ff1bcb900bf29489a9692816d79874bea351e7a8b6de96"
+checksum = "c7e468321c81fb07fa7f4c636c3972b9100f0346e5b6a9f2bd0603a52f7ed277"
 dependencies = [
- "curve25519-dalek 4.1.1",
+ "curve25519-dalek 4.1.2",
  "rand_core 0.6.4",
  "serde",
  "zeroize",
diff --git a/Cargo.toml b/Cargo.toml
index 1bc484aca6..7ba4afe8a2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,7 +18,7 @@ members = [
 # We exclude any crates that would depend on non mutually
 # exclusive feature flags and thus can't compile with the
 # workspace:
-exclude = ["testing/wasm-rpc-tests", "testing/wasm-lightclient-tests", "signer/wasm-tests", "examples/wasm-example", "examples/parachain-example"]
+exclude = ["testing/no-std-tests", "testing/wasm-rpc-tests", "testing/wasm-lightclient-tests", "signer/wasm-tests", "examples/wasm-example", "examples/parachain-example"]
 resolver = "2"
 
 [workspace.package]
@@ -58,15 +58,17 @@ bitvec = { version = "1", default-features = false }
 blake2 = { version = "0.10.6", default-features = false }
 clap = { version = "4.5.0", features = ["derive", "cargo"] }
 criterion = "0.4"
-codec = { package = "parity-scale-codec", version = "3.4.0", default-features = false }
+codec = { package = "parity-scale-codec", version = "3.6.9", default-features = false }
 color-eyre = "0.6.1"
 console_error_panic_hook = "0.1.7"
 darling = "0.20.5"
 derivative = "2.2.0"
+derive_more = "0.99.17"
 either = "1.10.0"
-frame-metadata = { version = "16.0.0", default-features = false, features = ["current", "std"] }
+frame-metadata = { version = "16.0.0", default-features = false }
 futures = { version = "0.3.30", default-features = false, features = ["std"] }
 getrandom = { version = "0.2", default-features = false }
+hashbrown = "0.14.3"
 hex = "0.4.3"
 heck = "0.4.1"
 impl-serde = { version = "0.4.0" }
@@ -78,7 +80,7 @@ proc-macro-error = "1.0.4"
 proc-macro2 = "1.0.78"
 quote = "1.0.35"
 regex = "1.10.3"
-scale-info = "2.10.0"
+scale-info = { version = "2.10.0", default-features = false }
 scale-value = "0.13.0"
 scale-bits = "0.4.0"
 scale-decode = "0.10.0"
diff --git a/metadata/Cargo.toml b/metadata/Cargo.toml
index 6e3669278d..a6e15de0aa 100644
--- a/metadata/Cargo.toml
+++ b/metadata/Cargo.toml
@@ -13,12 +13,17 @@ documentation.workspace = true
 homepage.workspace = true
 description = "Command line utilities for checking metadata compatibility between nodes."
 
+[features]
+default = ["std"]
+std = ["scale-info/std", "frame-metadata/std"]
+
 [dependencies]
-codec = { package = "parity-scale-codec", workspace = true, features = ["derive"] }
-frame-metadata = { workspace = true }
-scale-info = { workspace = true }
+scale-info = { workspace = true, default-features = false }
+frame-metadata = { workspace = true, default-features = false, features = ["current", "decode"] }
+codec = { package = "parity-scale-codec", workspace = true, default-features = false, features = ["derive"] }
 sp-core-hashing = { workspace = true }
-thiserror = { workspace = true }
+hashbrown = { workspace = true }
+derive_more = { workspace = true }
 
 [dev-dependencies]
 bitvec = { workspace = true, features = ["alloc"] }
diff --git a/metadata/src/from_into/mod.rs b/metadata/src/from_into/mod.rs
index 8170bc6133..1a950e1d5a 100644
--- a/metadata/src/from_into/mod.rs
+++ b/metadata/src/from_into/mod.rs
@@ -2,31 +2,37 @@
 // This file is dual-licensed as Apache-2.0 or GPL-3.0.
 // see LICENSE for license details.
 
+use alloc::string::String;
+use derive_more::Display;
+
 mod v14;
 mod v15;
 
 /// An error emitted if something goes wrong converting [`frame_metadata`]
 /// types into [`crate::Metadata`].
-#[derive(Debug, thiserror::Error, PartialEq, Eq)]
+#[derive(Debug, Display, PartialEq, Eq)]
 #[non_exhaustive]
 pub enum TryFromError {
     /// Type missing from type registry
-    #[error("Type id {0} is expected but not found in the type registry")]
+    #[display(fmt = "Type id {_0} is expected but not found in the type registry")]
     TypeNotFound(u32),
     /// Type was not a variant/enum type
-    #[error("Type {0} was not a variant/enum type, but is expected to be one")]
+    #[display(fmt = "Type {_0} was not a variant/enum type, but is expected to be one")]
     VariantExpected(u32),
     /// An unsupported metadata version was provided.
-    #[error("Cannot convert v{0} metadata into Metadata type")]
+    #[display(fmt = "Cannot convert v{_0} metadata into Metadata type")]
     UnsupportedMetadataVersion(u32),
     /// Type name missing from type registry
-    #[error("Type name {0} is expected but not found in the type registry")]
+    #[display(fmt = "Type name {_0} is expected but not found in the type registry")]
     TypeNameNotFound(String),
     /// Invalid type path.
-    #[error("Type has an invalid path {0}")]
+    #[display(fmt = "Type has an invalid path {_0}")]
     InvalidTypePath(String),
 }
 
+#[cfg(feature = "std")]
+impl std::error::Error for TryFromError {}
+
 impl From<crate::Metadata> for frame_metadata::RuntimeMetadataPrefixed {
     fn from(value: crate::Metadata) -> Self {
         let m: frame_metadata::v15::RuntimeMetadataV15 = value.into();
diff --git a/metadata/src/from_into/v14.rs b/metadata/src/from_into/v14.rs
index 7df5e95347..b9b13cf681 100644
--- a/metadata/src/from_into/v14.rs
+++ b/metadata/src/from_into/v14.rs
@@ -2,11 +2,15 @@
 // This file is dual-licensed as Apache-2.0 or GPL-3.0.
 // see LICENSE for license details.
 
-use std::collections::HashMap;
-
 use super::TryFromError;
 use crate::Metadata;
+use alloc::borrow::ToOwned;
+use alloc::string::String;
+use alloc::vec;
+use alloc::vec::Vec;
+use core::fmt::Write;
 use frame_metadata::{v14, v15};
+use hashbrown::HashMap;
 use scale_info::TypeDef;
 
 impl TryFrom<v14::RuntimeMetadataV14> for Metadata {
@@ -31,27 +35,27 @@ fn v15_to_v14(mut metadata: v15::RuntimeMetadataV15) -> v14::RuntimeMetadataV14
     let extrinsic_type = scale_info::Type {
         path: scale_info::Path {
             segments: vec![
-                "primitives".to_string(),
-                "runtime".to_string(),
-                "generic".to_string(),
-                "UncheckedExtrinsic".to_string(),
+                "primitives".to_owned(),
+                "runtime".to_owned(),
+                "generic".to_owned(),
+                "UncheckedExtrinsic".to_owned(),
             ],
         },
         type_params: vec![
             scale_info::TypeParameter::<scale_info::form::PortableForm> {
-                name: "Address".to_string(),
+                name: "Address".to_owned(),
                 ty: Some(metadata.extrinsic.address_ty),
             },
             scale_info::TypeParameter::<scale_info::form::PortableForm> {
-                name: "Call".to_string(),
+                name: "Call".to_owned(),
                 ty: Some(metadata.extrinsic.call_ty),
             },
             scale_info::TypeParameter::<scale_info::form::PortableForm> {
-                name: "Signature".to_string(),
+                name: "Signature".to_owned(),
                 ty: Some(metadata.extrinsic.signature_ty),
             },
             scale_info::TypeParameter::<scale_info::form::PortableForm> {
-                name: "Extra".to_string(),
+                name: "Extra".to_owned(),
                 ty: Some(metadata.extrinsic.extra_ty),
             },
         ],
@@ -342,7 +346,7 @@ fn generate_outer_enums(
         let Some(last) = call_path.last_mut() else {
             return Err(TryFromError::InvalidTypePath("RuntimeCall".into()));
         };
-        *last = "RuntimeError".to_string();
+        *last = "RuntimeError".to_owned();
         generate_outer_error_enum_type(metadata, call_path)
     };
 
@@ -368,7 +372,10 @@ fn generate_outer_error_enum_type(
                 return None;
             };
 
-            let path = format!("{}Error", pallet.name);
+            // Note:  using the `alloc::format!` macro like in `let path = format!("{}Error", pallet.name);`
+            // leads to linker errors about extern function `_Unwind_Resume` not being defined.
+            let mut path = String::new();
+            write!(path, "{}Error", pallet.name).expect("Cannot panic, qed;");
             let ty = error.ty.id.into();
 
             Some(scale_info::Variant {
diff --git a/metadata/src/from_into/v15.rs b/metadata/src/from_into/v15.rs
index f210089dce..37e4336543 100644
--- a/metadata/src/from_into/v15.rs
+++ b/metadata/src/from_into/v15.rs
@@ -3,6 +3,7 @@
 // see LICENSE for license details.
 
 use super::TryFromError;
+
 use crate::utils::variant_index::VariantIndex;
 use crate::{
     utils::ordered_map::OrderedMap, ArcStr, ConstantMetadata, ExtrinsicMetadata, Metadata,
@@ -10,9 +11,10 @@ use crate::{
     RuntimeApiMethodParamMetadata, SignedExtensionMetadata, StorageEntryMetadata,
     StorageEntryModifier, StorageEntryType, StorageHasher, StorageMetadata,
 };
+use alloc::borrow::ToOwned;
 use frame_metadata::v15;
+use hashbrown::HashMap;
 use scale_info::form::PortableForm;
-use std::collections::HashMap;
 
 // Converting from V15 metadata into our Subxt repr.
 mod from_v15 {
diff --git a/metadata/src/lib.rs b/metadata/src/lib.rs
index 4ebc68a44e..59a3ba484b 100644
--- a/metadata/src/lib.rs
+++ b/metadata/src/lib.rs
@@ -14,14 +14,19 @@
 //! 2. Obtaining [`frame_metadata::RuntimeMetadataPrefixed`], and then
 //!    using `.try_into()` to convert it into [`Metadata`].
 
+#![cfg_attr(not(feature = "std"), no_std)]
 #![deny(missing_docs)]
 
+extern crate alloc;
+
 mod from_into;
 mod utils;
 
+use alloc::string::String;
+use alloc::sync::Arc;
+use alloc::vec::Vec;
+use hashbrown::HashMap;
 use scale_info::{form::PortableForm, PortableRegistry, Variant};
-use std::collections::HashMap;
-use std::sync::Arc;
 use utils::variant_index::VariantIndex;
 use utils::{ordered_map::OrderedMap, validation::outer_enum_hashes::OuterEnumHashes};
 
@@ -200,7 +205,7 @@ impl Metadata {
             // its name to ensure that every unique type has a unique path, too.
             if *visited_count > 1 {
                 if let Some(name) = ty.ty.path.segments.last_mut() {
-                    *name = format!("{name}{visited_count}");
+                    *name = alloc::format!("{name}{visited_count}");
                 }
             }
         }
diff --git a/metadata/src/utils/ordered_map.rs b/metadata/src/utils/ordered_map.rs
index c9a9a40f46..614c25cf65 100644
--- a/metadata/src/utils/ordered_map.rs
+++ b/metadata/src/utils/ordered_map.rs
@@ -2,7 +2,9 @@
 // This file is dual-licensed as Apache-2.0 or GPL-3.0.
 // see LICENSE for license details.
 
-use std::collections::HashMap;
+use alloc::vec::Vec;
+use core::mem;
+use hashbrown::HashMap;
 
 /// A minimal ordered map to let one search for
 /// things by key or get the values in insert order.
@@ -23,7 +25,7 @@ impl<K, V> Default for OrderedMap<K, V> {
 
 impl<K, V> OrderedMap<K, V>
 where
-    K: PartialEq + Eq + std::hash::Hash,
+    K: PartialEq + Eq + core::hash::Hash,
 {
     /// Create a new, empty [`OrderedMap`].
     pub fn new() -> Self {
@@ -47,8 +49,8 @@ where
     where
         F: FnMut(&V) -> bool,
     {
-        let values = std::mem::take(&mut self.values);
-        let map = std::mem::take(&mut self.map);
+        let values = mem::take(&mut self.values);
+        let map = mem::take(&mut self.map);
 
         // Filter the values, storing a map from old to new positions:
         let mut new_values = Vec::new();
@@ -78,8 +80,8 @@ where
     /// Get an item by its key.
     pub fn get_by_key<Q>(&self, key: &Q) -> Option<&V>
     where
-        K: std::borrow::Borrow<Q>,
-        Q: std::hash::Hash + Eq + ?Sized,
+        K: alloc::borrow::Borrow<Q>,
+        Q: core::hash::Hash + Eq + ?Sized,
     {
         self.map.get(key).and_then(|&v| self.values.get(v))
     }
@@ -107,7 +109,7 @@ where
 
 impl<K, V> FromIterator<(K, V)> for OrderedMap<K, V>
 where
-    K: PartialEq + Eq + std::hash::Hash,
+    K: PartialEq + Eq + core::hash::Hash,
 {
     fn from_iter<T: IntoIterator<Item = (K, V)>>(iter: T) -> Self {
         let mut map = OrderedMap::new();
diff --git a/metadata/src/utils/retain.rs b/metadata/src/utils/retain.rs
index d33315c2aa..a160609597 100644
--- a/metadata/src/utils/retain.rs
+++ b/metadata/src/utils/retain.rs
@@ -8,8 +8,9 @@ use crate::{
     ExtrinsicMetadata, Metadata, OuterEnumsMetadata, PalletMetadataInner, RuntimeApiMetadataInner,
     StorageEntryType,
 };
+use alloc::collections::BTreeMap;
+use hashbrown::HashSet;
 use scale_info::TypeDef;
-use std::collections::{BTreeMap, HashSet};
 
 /// Collect all type IDs needed to represent the provided pallet.
 fn collect_pallet_types(pallet: &PalletMetadataInner, type_ids: &mut HashSet<u32>) {
diff --git a/metadata/src/utils/validation.rs b/metadata/src/utils/validation.rs
index 81c50b4593..2b1b1f5e33 100644
--- a/metadata/src/utils/validation.rs
+++ b/metadata/src/utils/validation.rs
@@ -8,9 +8,10 @@ use crate::{
     CustomMetadata, CustomValueMetadata, ExtrinsicMetadata, Metadata, PalletMetadata,
     RuntimeApiMetadata, RuntimeApiMethodMetadata, StorageEntryMetadata, StorageEntryType,
 };
+use alloc::vec::Vec;
+use hashbrown::HashMap;
 use outer_enum_hashes::OuterEnumHashes;
 use scale_info::{form::PortableForm, Field, PortableRegistry, TypeDef, TypeDefVariant, Variant};
-use std::collections::HashMap;
 
 pub mod outer_enum_hashes;
 
diff --git a/metadata/src/utils/validation/outer_enum_hashes.rs b/metadata/src/utils/validation/outer_enum_hashes.rs
index 33bd4f52c1..5e50fcb40e 100644
--- a/metadata/src/utils/validation/outer_enum_hashes.rs
+++ b/metadata/src/utils/validation/outer_enum_hashes.rs
@@ -1,6 +1,6 @@
 //! Hash representations of the `frame_metadata::v15::OuterEnums`.
 
-use std::collections::HashMap;
+use hashbrown::HashMap;
 
 use scale_info::{PortableRegistry, TypeDef};
 
diff --git a/metadata/src/utils/variant_index.rs b/metadata/src/utils/variant_index.rs
index bcc8a78902..9019aee3ab 100644
--- a/metadata/src/utils/variant_index.rs
+++ b/metadata/src/utils/variant_index.rs
@@ -2,8 +2,10 @@
 // This file is dual-licensed as Apache-2.0 or GPL-3.0.
 // see LICENSE for license details.
 
+use alloc::borrow::ToOwned;
+use alloc::string::String;
+use hashbrown::HashMap;
 use scale_info::{form::PortableForm, PortableRegistry, TypeDef, Variant};
-use std::collections::HashMap;
 
 /// Given some type ID and type registry, build a couple of
 /// indexes to look up variants by index or name. If the ID provided
@@ -62,8 +64,8 @@ impl VariantIndex {
         types: &'a PortableRegistry,
     ) -> Option<&'a Variant<PortableForm>>
     where
-        String: std::borrow::Borrow<K>,
-        K: std::hash::Hash + Eq + ?Sized,
+        String: alloc::borrow::Borrow<K>,
+        K: core::hash::Hash + Eq + ?Sized,
     {
         let pos = *self.by_name.get(name)?;
         let variants = Self::get(variant_id, types)?;
diff --git a/subxt/Cargo.toml b/subxt/Cargo.toml
index 5ff125d191..4a18bb2b41 100644
--- a/subxt/Cargo.toml
+++ b/subxt/Cargo.toml
@@ -25,20 +25,20 @@ default = ["jsonrpsee", "native"]
 # Enable this for native (ie non web/wasm builds).
 # Exactly 1 of "web" and "native" is expected.
 native = [
-    "jsonrpsee?/async-client",
-    "jsonrpsee?/client-ws-transport-native-tls",
-    "subxt-lightclient?/native",
+    "jsonrpsee?/async-client", 
+    "jsonrpsee?/client-ws-transport-native-tls", 
+    "subxt-lightclient?/native", 
     "tokio-util"
 ]
 
 # Enable this for web/wasm builds.
 # Exactly 1 of "web" and "native" is expected.
 web = [
-    "jsonrpsee?/async-wasm-client",
-    "jsonrpsee?/client-web-transport",
-    "getrandom/js",
-    "subxt-lightclient?/web",
-    "subxt-macro/web",
+    "jsonrpsee?/async-wasm-client", 
+    "jsonrpsee?/client-web-transport", 
+    "getrandom/js", 
+    "subxt-lightclient?/web", 
+    "subxt-macro/web", 
     "instant/wasm-bindgen"
 ]
 
diff --git a/testing/generate-custom-metadata/Cargo.toml b/testing/generate-custom-metadata/Cargo.toml
index 9ebff6bb13..14da285a13 100644
--- a/testing/generate-custom-metadata/Cargo.toml
+++ b/testing/generate-custom-metadata/Cargo.toml
@@ -12,6 +12,6 @@ homepage.workspace = true
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-scale-info = { workspace = true, features = ["bit-vec"] }
-frame-metadata = { workspace = true }
-codec = { package = "parity-scale-codec", workspace = true, features = ["derive", "bit-vec"] }
+scale-info = { workspace = true, features = ["std", "bit-vec"] }
+frame-metadata = { workspace = true, features = ["decode", "current"] }
+codec = { package = "parity-scale-codec", workspace = true, features = ["std", "derive", "bit-vec"] }
diff --git a/testing/no-std-tests/.gitignore b/testing/no-std-tests/.gitignore
new file mode 100644
index 0000000000..c41cc9e35e
--- /dev/null
+++ b/testing/no-std-tests/.gitignore
@@ -0,0 +1 @@
+/target
\ No newline at end of file
diff --git a/testing/no-std-tests/Cargo.lock b/testing/no-std-tests/Cargo.lock
new file mode 100644
index 0000000000..ee4afadfe7
--- /dev/null
+++ b/testing/no-std-tests/Cargo.lock
@@ -0,0 +1,487 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "ahash"
+version = "0.8.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77c3a9648d43b9cd48db467b3f87fdd6e146bcc88ab0180006cef2179fe11d01"
+dependencies = [
+ "cfg-if",
+ "once_cell",
+ "version_check",
+ "zerocopy",
+]
+
+[[package]]
+name = "allocator-api2"
+version = "0.2.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0942ffc6dcaadf03badf6e6a2d0228460359d5e34b57ccdc720b7382dfbd5ec5"
+
+[[package]]
+name = "arrayref"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6b4930d2cb77ce62f89ee5d5289b4ac049559b1c45539271f5ed4fdc7db34545"
+
+[[package]]
+name = "arrayvec"
+version = "0.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "96d30a06541fbafbc7f82ed10c06164cfbd2c401138f6addd8404629c4b16711"
+
+[[package]]
+name = "blake2b_simd"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23285ad32269793932e830392f2fe2f83e26488fd3ec778883a93c8323735780"
+dependencies = [
+ "arrayref",
+ "arrayvec",
+ "constant_time_eq",
+]
+
+[[package]]
+name = "block-buffer"
+version = "0.10.4"
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diff --git a/testing/no-std-tests/Cargo.toml b/testing/no-std-tests/Cargo.toml
new file mode 100644
index 0000000000..503326d5b5
--- /dev/null
+++ b/testing/no-std-tests/Cargo.toml
@@ -0,0 +1,21 @@
+[package]
+name = "subxt-core-no-std-tests"
+edition = "2021"
+publish = false
+version = "0.0.0"
+resolver = "2"
+
+[dependencies]
+subxt-metadata = { path = "../../metadata", default-features = false }
+codec = { package = "parity-scale-codec", version = "3.6.9", default-features = false, features = ["derive"] }
+libc_alloc = { version = "1.0.6" }
+
+[profile.dev]
+panic = "abort"
+
+[profile.release]
+panic = "abort"
+
+# this shouldn't be needed, it's in workspace.exclude, but still
+# I get the complaint unless I add it...
+[workspace]
diff --git a/testing/no-std-tests/README.md b/testing/no-std-tests/README.md
new file mode 100644
index 0000000000..2b662bb455
--- /dev/null
+++ b/testing/no-std-tests/README.md
@@ -0,0 +1,7 @@
+# No-Std Testing Crate
+
+To test the no-std compatibility of various subxt-* crates, please run:
+
+```bash
+cargo build --target thumbv7em-none-eabi
+```
\ No newline at end of file
diff --git a/testing/no-std-tests/rust-toolchain b/testing/no-std-tests/rust-toolchain
new file mode 100644
index 0000000000..07ade694b1
--- /dev/null
+++ b/testing/no-std-tests/rust-toolchain
@@ -0,0 +1 @@
+nightly
\ No newline at end of file
diff --git a/testing/no-std-tests/src/main.rs b/testing/no-std-tests/src/main.rs
new file mode 100644
index 0000000000..09d8775fc5
--- /dev/null
+++ b/testing/no-std-tests/src/main.rs
@@ -0,0 +1,47 @@
+// Copyright 2019-2023 Parity Technologies (UK) Ltd.
+// This file is dual-licensed as Apache-2.0 or GPL-3.0.
+// see LICENSE for license details.
+
+#![allow(internal_features)]
+#![feature(lang_items, start)]
+#![feature(alloc_error_handler)]
+#![no_std]
+
+#[start]
+fn start(_argc: isize, _argv: *const *const u8) -> isize {
+    compile_test();
+    0
+}
+
+#[lang = "eh_personality"]
+#[no_mangle]
+pub extern "C" fn rust_eh_personality() {}
+
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    loop {}
+}
+
+use libc_alloc::LibcAlloc;
+
+#[global_allocator]
+static ALLOCATOR: LibcAlloc = LibcAlloc;
+
+//////////////////////////////////////////////////////////////////////////////
+
+extern crate alloc;
+
+/// Including code here makes sure it is not pruned.
+/// We want all code included to compile fine for the `thumbv7em-none-eabi` target.
+fn compile_test() {
+    subxt_metadata_compiles();
+}
+
+fn subxt_metadata_compiles() {
+    use codec::Decode;
+    let bytes: alloc::vec::Vec<u8> = alloc::vec![0, 1, 2, 3, 4];
+    subxt_metadata::Metadata::decode(&mut &bytes[..]).expect_err("invalid byte sequence");
+
+    const METADATA: &[u8] = include_bytes!("../../../artifacts/polkadot_metadata_small.scale");
+    subxt_metadata::Metadata::decode(&mut &METADATA[..]).expect("should be valid metadata");
+}