broken commit, prelude but no replacement of all std types

testing/no-std-tests/Cargo.toml

@@ -0,0 +1,24 @@
+[package]
+name = "no-std-tests"
+edition = "2021"
+publish = false
+version = "0.0.0"
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+
+scale-info = { workspace = true, default-features = false, features = ["bit-vec", "derive"] }
+codec = { package = "parity-scale-codec", workspace = true, default-features = false, features = ["derive", "bit-vec"] }
+subxt = { workspace = true, default-features = false, features = ["native"] }
+subxt-metadata = { workspace = true, default-features = false }
+
+hex = { version = "0.4.3", default-features = false, features = ["alloc"] }
+libc = { version = "0.2", default-features = false }
+libc_alloc = { version = "1.0.6" }
+
+
+[profile.dev]
+panic = "abort"
+
+[profile.release]
+panic = "abort"

testing/no-std-tests/rust-toolchain

@@ -0,0 +1 @@
+nightly

testing/no-std-tests/src/main.rs

@@ -0,0 +1,71 @@
+// Copyright 2019-2020
+//     Parity Technologies (UK) Ltd. Technologies (UK) Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#![allow(internal_features)]
+#![feature(lang_items, start)]
+#![feature(alloc_error_handler)]
+#![no_std]
+
+#[start]
+fn start(_argc: isize, _argv: *const *const u8) -> isize {
+    main();
+    0
+}
+
+#[lang = "eh_personality"]
+#[no_mangle]
+pub extern "C" fn rust_eh_personality() {}
+
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    unsafe {
+        libc::abort();
+    }
+}
+
+use libc_alloc::LibcAlloc;
+
+#[global_allocator]
+static ALLOCATOR: LibcAlloc = LibcAlloc;
+
+//////////////////////////////////////////////////////////////////////////////
+
+use subxt::utils::H256;
+
+// Note: Panics in this function will lead to `Aborted (core dumped)` and a non-zero exit status => suitable for CI tests.
+fn main() {
+    let metadata_bytes: &[u8] = include_bytes!("../../../artifacts/polkadot_metadata_small.scale");
+
+    let genesis_hash = {
+        let h = "91b171bb158e2d3848fa23a9f1c25182fb8e20313b2c1eb49219da7a70ce90c3";
+        let bytes = hex::decode(h).unwrap();
+        H256::from_slice(&bytes)
+    };
+
+    // // 2. A runtime version (system_version constant on a Substrate node has these):
+    // let runtime_version = subxt::backend::RuntimeVersion {
+    //     spec_version: 9370,
+    //     transaction_version: 20,
+    // };
+
+    // // 3. Metadata (I'll load it from the downloaded metadata, but you can use
+    // //    `subxt metadata > file.scale` to download it):
+    // let metadata = {
+    //     let bytes: &[u8] = include_bytes!("../polkadot_metadata_small.scale");
+    //     Metadata::decode(&mut &*bytes).unwrap()
+    // };
+
+    // // Create an offline client using the details obtained above:
+    // let api = OfflineClient::<PolkadotConfig>::new(genesis_hash, runtime_version, metadata);
+}