fix no_std compatability

.github/workflows/rust.yml

@@ -22,23 +22,13 @@ jobs:
         fetch-depth: 0
     - name: Run tests
       run: |
-        cargo test --verbose --workspace
-        sudo apt install libcurl4-openssl-dev libelf-dev libdw-dev cmake gcc binutils-dev libiberty-dev
-        cd borsh
-        cargo test --verbose # --no-default-features
-        wget https://github.com/SimonKagstrom/kcov/archive/master.tar.gz
-        tar xzf master.tar.gz
-        cd kcov-master
-        mkdir build
-        cd build
-        cmake ..
-        make
-        make install DESTDIR=../../kcov-build
-        cd ../..
-        rm -rf kcov-master
-        for file in target/debug/*; do [ -x "${file}" ] || continue; mkdir -p "target/cov/$(basename $file)"; ./kcov-build/usr/local/bin/kcov --exclude-pattern=/.cargo,/usr/lib --verify "target/cov/$(basename $file)" "$file"; done
-        bash <(curl -s https://codecov.io/bash)
-        echo "Uploaded code coverage"	  echo "Uploaded code coverage"
+        pushd borsh
+        cargo test --no-run
+        cargo test
+        cargo test --no-default-features
+        cargo test --all-features
+        popd
+        cargo test --workspace
 
   clippy:
     runs-on: ubuntu-20.04
@@ -54,7 +44,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Run cargo fmt
-      run: cargo fmt --all -- --check
+      run: cargo fmt --check
 
   publish:
     runs-on: ubuntu-20.04

CHANGELOG.md

@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.9.3] - 2022-02-03
+
+- Fix `no_std` compatibility.
+- Reduce code bloat in derived `BorshSerialize` impl for enums.
+
 ## [0.9.2] - 2022-01-25
 
 - Upgrade hashbrown from `0.9` to `0.11`. This can breakage in the rare case

Cargo.toml

@@ -10,5 +10,5 @@ members = [
 
 [workspace.metadata.workspaces]
 # shared version of all public crates in the workspace
-version = "0.9.2"
+version = "0.9.3"
 exclude = [ "fuzz/*", "benchmarks" ]

borsh/src/de/mod.rs

@@ -12,6 +12,7 @@ use crate::maybestd::{
     format,
     io::{Error, ErrorKind, Result},
     string::{String, ToString},
+    vec,
     vec::Vec,
 };