diff --git a/polkadot/.travis.yml b/polkadot/.travis.yml
new file mode 100644
index 0000000000000000000000000000000000000000..040523096e323a085ac552e804d423300837ca8e
--- /dev/null
+++ b/polkadot/.travis.yml
@@ -0,0 +1,33 @@
+# Request an environment that provides sudo (that goes with larger containers)
+# and a minimal language environment.
+sudo: true
+language: minimal
+
+cache: cargo
+
+branches:
+  only:
+  - master
+
+env:
+  global:
+    - RUST_BACKTRACE=1
+  matrix:
+    - RUST_TOOLCHAIN=nightly TARGET=wasm
+    - RUST_TOOLCHAIN=stable TARGET=native
+
+before_install:
+  # Check how much space we've got on this machine.
+  - df -h
+
+script:
+  - ./ci/script.sh
+
+after_success:
+  - if [ "$TARGET" == "wasm" ] && [ "$TRAVIS_PULL_REQUEST" != "true" ] && [ "$TRAVIS_BRANCH" == "master" ]; then
+      ./ci/publish-wasm.sh;
+    fi
+
+after_script:
+  # Check how much free disk space left after the build
+  - df -h
diff --git a/polkadot/ci/publish-wasm.sh b/polkadot/ci/publish-wasm.sh
new file mode 100755
index 0000000000000000000000000000000000000000..ee1db2942f722a35107af146a79bf8ed51098394
--- /dev/null
+++ b/polkadot/ci/publish-wasm.sh
@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+
+# Publish wasm binaries into the special repository.
+# This script assumes that wasm binaries have already been built.
+# Requires GH_TOKEN environment variable to be defined.
+
+set -e
+
+source ./common.sh
+
+if [ -z ${GH_TOKEN+x} ]; then
+	echo "GH_TOKEN environment variable is not set"
+	exit 1
+fi
+
+REPO="github.com/paritytech/polkadot-wasm-bin.git"
+REPO_AUTH="${GH_TOKEN}:@${REPO}"
+DST=".wasm-binaries"
+TARGET="wasm32-unknown-unknown"
+UTCDATE=`date -u "+%Y%m%d.%H%M%S.0"`
+
+pushd .
+
+echo "*** Cloning repo"
+rm -rf $DST
+git clone https://$REPO $DST
+cd $DST
+rm -rf $TARGET
+mkdir -p $TARGET
+
+echo "*** Setting up GH config"
+git config push.default simple
+git config merge.ours.driver true
+git config user.email "admin@parity.io"
+git config user.name "CI Build"
+git remote set-url origin https://$REPO_AUTH > /dev/null 2>&1
+
+for SRC in "${SRCS[@]}"
+do
+  echo "*** Copying wasm binaries from $SRC"
+  cp ../$SRC/target/$TARGET/release/*.wasm $TARGET
+done
+
+if [ -f "package.json" ]; then
+  echo "*** Updating package.json"
+  sed -i -e "s/\"version\": \"[0-9.]*\"/\"version\": \"$UTCDATE\"/g" package.json
+  rm -rf package.json.bak
+fi
+
+echo "*** Adding to git"
+echo "$UTCDATE" > README.md
+git add --all .
+git commit -m "$UTCDATE"
+
+echo "*** Pushing upstream"
+git push --quiet origin HEAD:refs/heads/master > /dev/null 2>&1
+
+echo "*** Cleanup"
+cd ..
+rm -rf $DST
+popd
+
+echo "*** Completed"
+exit 0
diff --git a/polkadot/ci/script.sh b/polkadot/ci/script.sh
new file mode 100755
index 0000000000000000000000000000000000000000..812da2d816805e6865ef8eccb43c6a13740c86ad
--- /dev/null
+++ b/polkadot/ci/script.sh
@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+set -eux
+
+# Install rustup and the specified rust toolchain.
+curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain=$RUST_TOOLCHAIN -y
+
+# Load cargo environment. Specifically, put cargo into PATH.
+source ~/.cargo/env
+
+rustc --version
+rustup --version
+cargo --version
+
+case $TARGET in
+	"native")
+		sudo apt-get -y update
+		sudo apt-get install -y cmake pkg-config libssl-dev
+
+		cargo test --all --locked
+		;;
+
+	"wasm")
+		# Install prerequisites and build all wasm projects
+		./scripts/init.sh
+		./scripts/build.sh
+		./scripts/build-demos.sh
+		;;
+esac
diff --git a/polkadot/runtime/wasm/Cargo.lock b/polkadot/runtime/wasm/Cargo.lock
index b452d6cfaddcee239439021fa3740a49560c310b..c309ebb41c68e375b589aee09f2143385d09f8ae 100644
--- a/polkadot/runtime/wasm/Cargo.lock
+++ b/polkadot/runtime/wasm/Cargo.lock
@@ -84,12 +84,13 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "ed25519"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 dependencies = [
  "base58 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "blake2-rfc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "ring 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "substrate-primitives 0.1.0",
+ "substrate-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
  "untrusted 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -104,6 +105,7 @@ dependencies = [
 [[package]]
 name = "environmental"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 
 [[package]]
 name = "ethbloom"
@@ -371,11 +373,11 @@ version = "0.1.0"
 dependencies = [
  "serde 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
- "substrate-codec 0.1.0",
- "substrate-codec-derive 0.1.0",
- "substrate-primitives 0.1.0",
- "substrate-runtime-primitives 0.1.0",
- "substrate-runtime-std 0.1.0",
+ "substrate-codec 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-codec-derive 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
 ]
 
 [[package]]
@@ -385,21 +387,21 @@ dependencies = [
  "integer-sqrt 0.1.0 (git+https://github.com/paritytech/integer-sqrt-rs.git)",
  "polkadot-primitives 0.1.0",
  "safe-mix 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "substrate-codec 0.1.0",
- "substrate-primitives 0.1.0",
- "substrate-runtime-consensus 0.1.0",
- "substrate-runtime-council 0.1.0",
- "substrate-runtime-democracy 0.1.0",
- "substrate-runtime-executive 0.1.0",
- "substrate-runtime-io 0.1.0",
- "substrate-runtime-primitives 0.1.0",
- "substrate-runtime-session 0.1.0",
- "substrate-runtime-staking 0.1.0",
- "substrate-runtime-std 0.1.0",
- "substrate-runtime-support 0.1.0",
- "substrate-runtime-system 0.1.0",
- "substrate-runtime-timestamp 0.1.0",
- "substrate-runtime-version 0.1.0",
+ "substrate-codec 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-consensus 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-council 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-democracy 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-executive 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-io 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-session 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-staking 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-support 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-system 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-timestamp 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-version 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
 ]
 
 [[package]]
@@ -426,14 +428,16 @@ dependencies = [
 [[package]]
 name = "pwasm-alloc"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 dependencies = [
- "pwasm-libc 0.1.0",
+ "pwasm-libc 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
  "rustc_version 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "pwasm-libc"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 
 [[package]]
 name = "quote"
@@ -592,6 +596,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "substrate-codec"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 dependencies = [
  "arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -599,6 +604,7 @@ dependencies = [
 [[package]]
 name = "substrate-codec-derive"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 dependencies = [
  "proc-macro2 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -608,8 +614,9 @@ dependencies = [
 [[package]]
 name = "substrate-keyring"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 dependencies = [
- "ed25519 0.1.0",
+ "ed25519 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
  "hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -617,6 +624,7 @@ dependencies = [
 [[package]]
 name = "substrate-primitives"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 dependencies = [
  "blake2-rfc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -630,9 +638,9 @@ dependencies = [
  "rustc-hex 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
- "substrate-codec 0.1.0",
- "substrate-codec-derive 0.1.0",
- "substrate-runtime-std 0.1.0",
+ "substrate-codec 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-codec-derive 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
  "tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "twox-hash 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "uint 0.2.2 (git+https://github.com/paritytech/parity-common)",
@@ -642,234 +650,249 @@ dependencies = [
 [[package]]
 name = "substrate-runtime-consensus"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 dependencies = [
  "hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
- "substrate-codec 0.1.0",
- "substrate-primitives 0.1.0",
- "substrate-runtime-io 0.1.0",
- "substrate-runtime-primitives 0.1.0",
- "substrate-runtime-std 0.1.0",
- "substrate-runtime-support 0.1.0",
- "substrate-runtime-system 0.1.0",
+ "substrate-codec 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-io 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-support 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-system 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
 ]
 
 [[package]]
 name = "substrate-runtime-council"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 dependencies = [
  "hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "integer-sqrt 0.1.0 (git+https://github.com/paritytech/integer-sqrt-rs.git)",
  "safe-mix 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
- "substrate-codec 0.1.0",
- "substrate-keyring 0.1.0",
- "substrate-primitives 0.1.0",
- "substrate-runtime-consensus 0.1.0",
- "substrate-runtime-democracy 0.1.0",
- "substrate-runtime-io 0.1.0",
- "substrate-runtime-primitives 0.1.0",
- "substrate-runtime-session 0.1.0",
- "substrate-runtime-staking 0.1.0",
- "substrate-runtime-std 0.1.0",
- "substrate-runtime-support 0.1.0",
- "substrate-runtime-system 0.1.0",
+ "substrate-codec 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-keyring 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-consensus 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-democracy 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-io 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-session 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-staking 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-support 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-system 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
 ]
 
 [[package]]
 name = "substrate-runtime-democracy"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 dependencies = [
  "hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "safe-mix 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
- "substrate-codec 0.1.0",
- "substrate-codec-derive 0.1.0",
- "substrate-primitives 0.1.0",
- "substrate-runtime-consensus 0.1.0",
- "substrate-runtime-io 0.1.0",
- "substrate-runtime-primitives 0.1.0",
- "substrate-runtime-session 0.1.0",
- "substrate-runtime-staking 0.1.0",
- "substrate-runtime-std 0.1.0",
- "substrate-runtime-support 0.1.0",
- "substrate-runtime-system 0.1.0",
+ "substrate-codec 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-codec-derive 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-consensus 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-io 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-session 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-staking 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-support 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-system 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
 ]
 
 [[package]]
 name = "substrate-runtime-executive"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 dependencies = [
  "hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
- "substrate-codec 0.1.0",
- "substrate-runtime-io 0.1.0",
- "substrate-runtime-primitives 0.1.0",
- "substrate-runtime-std 0.1.0",
- "substrate-runtime-support 0.1.0",
- "substrate-runtime-system 0.1.0",
+ "substrate-codec 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-io 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-support 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-system 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
 ]
 
 [[package]]
 name = "substrate-runtime-io"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 dependencies = [
- "ed25519 0.1.0",
- "environmental 0.1.0",
+ "ed25519 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "environmental 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
  "rustc_version 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "substrate-codec 0.1.0",
- "substrate-primitives 0.1.0",
- "substrate-runtime-std 0.1.0",
- "substrate-state-machine 0.1.0",
+ "substrate-codec 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-state-machine 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
  "triehash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "substrate-runtime-primitives"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 dependencies = [
  "integer-sqrt 0.1.0 (git+https://github.com/paritytech/integer-sqrt-rs.git)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
- "substrate-codec 0.1.0",
- "substrate-codec-derive 0.1.0",
- "substrate-primitives 0.1.0",
- "substrate-runtime-io 0.1.0",
- "substrate-runtime-std 0.1.0",
- "substrate-runtime-support 0.1.0",
+ "substrate-codec 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-codec-derive 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-io 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-support 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
 ]
 
 [[package]]
 name = "substrate-runtime-sandbox"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 dependencies = [
  "rustc_version 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "substrate-codec 0.1.0",
- "substrate-primitives 0.1.0",
- "substrate-runtime-io 0.1.0",
- "substrate-runtime-std 0.1.0",
+ "substrate-codec 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-io 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
  "wasmi 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "substrate-runtime-session"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 dependencies = [
  "hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "safe-mix 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
- "substrate-codec 0.1.0",
- "substrate-keyring 0.1.0",
- "substrate-primitives 0.1.0",
- "substrate-runtime-consensus 0.1.0",
- "substrate-runtime-io 0.1.0",
- "substrate-runtime-primitives 0.1.0",
- "substrate-runtime-std 0.1.0",
- "substrate-runtime-support 0.1.0",
- "substrate-runtime-system 0.1.0",
- "substrate-runtime-timestamp 0.1.0",
+ "substrate-codec 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-keyring 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-consensus 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-io 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-support 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-system 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-timestamp 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
 ]
 
 [[package]]
 name = "substrate-runtime-staking"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 dependencies = [
  "hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "safe-mix 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
- "substrate-codec 0.1.0",
- "substrate-keyring 0.1.0",
- "substrate-primitives 0.1.0",
- "substrate-runtime-consensus 0.1.0",
- "substrate-runtime-io 0.1.0",
- "substrate-runtime-primitives 0.1.0",
- "substrate-runtime-sandbox 0.1.0",
- "substrate-runtime-session 0.1.0",
- "substrate-runtime-std 0.1.0",
- "substrate-runtime-support 0.1.0",
- "substrate-runtime-system 0.1.0",
- "substrate-runtime-timestamp 0.1.0",
+ "substrate-codec 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-keyring 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-consensus 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-io 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-sandbox 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-session 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-support 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-system 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-timestamp 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
 ]
 
 [[package]]
 name = "substrate-runtime-std"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 dependencies = [
- "pwasm-alloc 0.1.0",
- "pwasm-libc 0.1.0",
+ "pwasm-alloc 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "pwasm-libc 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
  "rustc_version 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "substrate-runtime-support"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 dependencies = [
- "ed25519 0.1.0",
+ "ed25519 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
  "hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
- "substrate-codec 0.1.0",
- "substrate-primitives 0.1.0",
- "substrate-runtime-io 0.1.0",
- "substrate-runtime-std 0.1.0",
+ "substrate-codec 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-io 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
 ]
 
 [[package]]
 name = "substrate-runtime-system"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 dependencies = [
  "hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "safe-mix 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
- "substrate-codec 0.1.0",
- "substrate-primitives 0.1.0",
- "substrate-runtime-io 0.1.0",
- "substrate-runtime-primitives 0.1.0",
- "substrate-runtime-std 0.1.0",
- "substrate-runtime-support 0.1.0",
+ "substrate-codec 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-io 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-support 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
 ]
 
 [[package]]
 name = "substrate-runtime-timestamp"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 dependencies = [
  "hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
- "substrate-codec 0.1.0",
- "substrate-primitives 0.1.0",
- "substrate-runtime-consensus 0.1.0",
- "substrate-runtime-io 0.1.0",
- "substrate-runtime-primitives 0.1.0",
- "substrate-runtime-std 0.1.0",
- "substrate-runtime-support 0.1.0",
- "substrate-runtime-system 0.1.0",
+ "substrate-codec 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-consensus 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-io 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-support 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-system 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
 ]
 
 [[package]]
 name = "substrate-runtime-version"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 dependencies = [
  "serde 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
- "substrate-codec 0.1.0",
- "substrate-codec-derive 0.1.0",
- "substrate-runtime-std 0.1.0",
- "substrate-runtime-support 0.1.0",
+ "substrate-codec 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-codec-derive 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
+ "substrate-runtime-support 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
 ]
 
 [[package]]
 name = "substrate-state-machine"
 version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=split-substrate#e3f6cd86348c34f50e9c19b00022836b196cbd29"
 dependencies = [
  "byteorder 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "hashdb 0.2.1 (git+https://github.com/paritytech/parity-common)",
@@ -880,7 +903,7 @@ dependencies = [
  "parking_lot 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "patricia-trie 0.2.1 (git+https://github.com/paritytech/parity-common)",
  "rlp 0.2.1 (git+https://github.com/paritytech/parity-common)",
- "substrate-primitives 0.1.0",
+ "substrate-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)",
  "triehash 0.2.0 (git+https://github.com/paritytech/parity-common)",
 ]
 
@@ -1018,7 +1041,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum crossbeam-epoch 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "927121f5407de9956180ff5e936fe3cf4324279280001cd56b669d28ee7e9150"
 "checksum crossbeam-utils 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "2760899e32a1d58d5abb31129f8fae5de75220bc2176e77ff7c627ae45c918d9"
 "checksum crunchy 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "a2f4a431c5c9f662e1200b7c7f02c34e91361150e382089a8f2dec3ba680cbda"
+"checksum ed25519 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
 "checksum elastic-array 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "88d4851b005ef16de812ea9acdb7bece2f0a40dd86c07b85631d7dafa54537bb"
+"checksum environmental 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
 "checksum ethbloom 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1a93a43ce2e9f09071449da36bfa7a1b20b950ee344b6904ff23de493b03b386"
 "checksum ethereum-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9c48729b8aea8aedb12cf4cb2e5cef439fdfe2dda4a89e47eeebd15778ef53b6"
 "checksum ethereum-types-serialize 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4ac59a21a9ce98e188f3dace9eb67a6c4a3c67ec7fbc7218cb827852679dc002"
@@ -1055,6 +1080,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum proc-macro-hack 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3ba8d4f9257b85eb6cdf13f055cea3190520aab1409ca2ab43493ea4820c25f0"
 "checksum proc-macro-hack-impl 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d5cb6f960ad471404618e9817c0e5d10b1ae74cfdf01fab89ea0641fe7fb2892"
 "checksum proc-macro2 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)" = "1fa93823f53cfd0f5ac117b189aed6cfdfb2cfc0a9d82e956dd7927595ed7d46"
+"checksum pwasm-alloc 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
+"checksum pwasm-libc 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
 "checksum quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)" = "e44651a0dc4cdd99f71c83b561e221f714912d11af1a4dff0631f923d53af035"
 "checksum rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)" = "15a732abf9d20f0ad8eeb6f909bf6868722d9a06e1e50802b6a70351f40b4eb1"
 "checksum rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "eba5f8cb59cc50ed56be8880a5c7b496bfd9bd26394e176bc67884094145c2c5"
@@ -1074,6 +1101,25 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum serde_derive 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)" = "79e4620ba6fbe051fc7506fab6f84205823564d55da18d55b695160fb3479cd8"
 "checksum smallvec 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)" = "211a489e65e94b103926d2054ae515a1cdb5d515ea0ef414fee23b7e043ce748"
 "checksum stable_deref_trait 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "15132e0e364248108c5e2c02e3ab539be8d6f5d52a01ca9bbf27ed657316f02b"
+"checksum substrate-codec 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
+"checksum substrate-codec-derive 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
+"checksum substrate-keyring 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
+"checksum substrate-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
+"checksum substrate-runtime-consensus 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
+"checksum substrate-runtime-council 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
+"checksum substrate-runtime-democracy 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
+"checksum substrate-runtime-executive 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
+"checksum substrate-runtime-io 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
+"checksum substrate-runtime-primitives 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
+"checksum substrate-runtime-sandbox 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
+"checksum substrate-runtime-session 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
+"checksum substrate-runtime-staking 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
+"checksum substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
+"checksum substrate-runtime-support 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
+"checksum substrate-runtime-system 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
+"checksum substrate-runtime-timestamp 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
+"checksum substrate-runtime-version 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
+"checksum substrate-state-machine 0.1.0 (git+https://github.com/paritytech/polkadot?branch=split-substrate)" = "<none>"
 "checksum syn 0.14.1 (registry+https://github.com/rust-lang/crates.io-index)" = "6dfd71b2be5a58ee30a6f8ea355ba8290d397131c00dfa55c3d34e6e13db5101"
 "checksum tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e9175261fbdb60781fcd388a4d6cc7e14764a2b629a7ad94abb439aed223a44f"
 "checksum triehash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "2033893a813c70e7d8a739ca6c36dc0a7a2c913ec718d7cbf84a3837bbe3c7ce"
diff --git a/polkadot/scripts/build-demos.sh b/polkadot/scripts/build-demos.sh
new file mode 100755
index 0000000000000000000000000000000000000000..285da143c17d8ec4c0f4147dea62dc34843050bf
--- /dev/null
+++ b/polkadot/scripts/build-demos.sh
@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+
+# This script assumes that all pre-requisites are installed.
+
+set -e
+
+PROJECT_ROOT=`git rev-parse --show-toplevel`
+source `dirname "$0"`/common.sh
+
+export CARGO_INCREMENTAL=0
+
+# Save current directory.
+pushd .
+
+cd $ROOT
+
+for DEMO in "${DEMOS[@]}"
+do
+  echo "*** Building wasm binaries in $DEMO"
+  cd "$PROJECT_ROOT/$DEMO"
+
+  ./build.sh
+
+  cd - >> /dev/null
+done
+
+# Restore initial directory.
+popd
diff --git a/polkadot/scripts/build.sh b/polkadot/scripts/build.sh
new file mode 100755
index 0000000000000000000000000000000000000000..9cacf74dbb07a6ca5b135959d3e08b11a3da50a0
--- /dev/null
+++ b/polkadot/scripts/build.sh
@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+
+# This script assumes that all pre-requisites are installed.
+
+set -e
+
+PROJECT_ROOT=`git rev-parse --show-toplevel`
+source `dirname "$0"`/common.sh
+
+export CARGO_INCREMENTAL=0
+
+# Save current directory.
+pushd .
+
+cd $ROOT
+
+for SRC in "${SRCS[@]}"
+do
+  echo "*** Building wasm binaries in $SRC"
+  cd "$PROJECT_ROOT/$SRC"
+
+  ./build.sh
+
+  cd - >> /dev/null
+done
+
+# Restore initial directory.
+popd
diff --git a/polkadot/scripts/common.sh b/polkadot/scripts/common.sh
new file mode 100644
index 0000000000000000000000000000000000000000..56e16bd48121a438c4089b4577d4c3238e5296a6
--- /dev/null
+++ b/polkadot/scripts/common.sh
@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+ROOT=`dirname "$0"`
+
+# A list of directories which contain wasm projects.
+SRCS=(
+	"runtime/wasm"
+)
+
+DEMOS=(
+	"test-parachains/"
+)
+
+# Make pushd/popd silent.
+
+pushd () {
+	command pushd "$@" > /dev/null
+}
+
+popd () {
+	command popd "$@" > /dev/null
+}
diff --git a/polkadot/scripts/init.sh b/polkadot/scripts/init.sh
new file mode 100755
index 0000000000000000000000000000000000000000..e3618783c14a7a27035f72ac0374e0ba82b5368e
--- /dev/null
+++ b/polkadot/scripts/init.sh
@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+set -e
+
+echo "*** Initialising WASM build environment"
+
+rustup update nightly
+rustup target add wasm32-unknown-unknown --toolchain nightly
+rustup update stable
+
+# Install wasm-gc. It's useful for stripping slimming down wasm binaries.
+command -v wasm-gc || \
+	cargo +nightly install --git https://github.com/alexcrichton/wasm-gc