diff --git a/run b/run
index 3b3708f..69b26cb 100755
--- a/run
+++ b/run
@@ -1,37 +1,76 @@
 #!/usr/bin/env bash
-set -xeuo pipefail
 
 HERE=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" &>/dev/null && pwd)
 
+# commit e7d28344fa3ee81d6ad7ca5ce1f83d50d8502118
+# Merge: 817cf6a82e 20d86d9c63
+# Author: Andrew Kelley <andrew@ziglang.org>
+# Date:   2022-12-07T01:52:39+02:00
+#
+#     Merge pull request #13560 from ziglang/wasi-bootstrap
+#
+#     Nuke the C++ implementation of Zig from orbit using WASI
+MERGE_WASI_BOOTSTRAP=0.10.0-610-ge7d28344fa
+
+# commit 3ba916584db5485c38ebf2390e8d22bc6d81bf8e
+# Author: Andrew Kelley <andrew@ziglang.org>
+# Date:   2022-11-05T03:47:19+02:00
+#
+#     actually remove stage1
+REMOVE_STAGE1=0.10.0-542-g3ba916584d
+
+# commit 28514476ef8c824c3d189d98f23d0f8d23e496ea
+# Author: Andrew Kelley <andrew@ziglang.org>
+# Date:   2022-11-01T05:29:55+02:00
+#
+#     remove `-fstage1` option
+#
+#     After this commit, the self-hosted compiler does not offer the option to
+#     use stage1 as a backend anymore.
+REMOVE_FSTAGE1=0.10.0-539-g28514476ef
+
+# commit 9d93b2ccf11f584320a2c5209dd2d94705167695
+# Author: Veikka Tuominen <git@vexu.eu>
+# Date:   2022-12-08T19:52:05+02:00
+#
+#     Eliminate `BoundFn` type from the language
+#
+#     Closes #9484
+BOUNDFN=0.10.0-675-g9d93b2ccf1
+
+# commit d10fd78d4615f329141f5c19f893039d56aff425
+# Author: Andrew Kelley <andrew@ziglang.org>
+# Date:   2022-12-10T21:54:24+02:00
+#
+#     update zig1.wasm
+#
+#     This includes the latest changes from master branch with fixes to the C
+#     backend that affect aarch64-windows which are necessary to build from
+#     source on this target.
+#
+#  stage1/zig1.wasm | Bin 2315523 -> 2315899 bytes
+#  1 file changed, 0 insertions(+), 0 deletions(-)
+C_AARCH64=0.10.0-722-gd10fd78d46
+
+# commit 51ed5416ab2969a366c8c6bdc487f357bad267c3
+# Author: Veikka Tuominen <git@vexu.eu>
+# Date:   2022-12-12T15:40:18+02:00
+#
+#     update zig1.wasm to `@call` changes
+CALL_CHANGES=0.10.0-749-g51ed5416ab
+
+# commit 2a5e1426aa9469fadb78e837d0100d689213b034
+# Author: Veikka Tuominen <git@vexu.eu>
+# Date:   2022-12-16T19:44:25+02:00
+#
+#     update zig1.wasm to builtin.Type field changes
+BUILTIN_TYPE=0.10.0-853-g2a5e1426aa
+
 step00() {
-  # commit e7d28344fa3ee81d6ad7ca5ce1f83d50d8502118
-  # Merge: 817cf6a82e 20d86d9c63
-  # Author: Andrew Kelley <andrew@ziglang.org>
-  # Date:   2022-12-07T01:52:39+02:00
-  #
-  #     Merge pull request #13560 from ziglang/wasi-bootstrap
-  #
-  #     Nuke the C++ implementation of Zig from orbit using WASI
-  local MERGE_WASI_BOOTSTRAP=0.10.0-610-ge7d28344fa
   git checkout $MERGE_WASI_BOOTSTRAP
 
-  # commit 3ba916584db5485c38ebf2390e8d22bc6d81bf8e
-  # Author: Andrew Kelley <andrew@ziglang.org>
-  # Date:   2022-11-05T03:47:19+02:00
-  #
-  #     actually remove stage1
-  local REMOVE_STAGE1=0.10.0-542-g3ba916584d
   git revert --no-edit $REMOVE_STAGE1
 
-  # commit 28514476ef8c824c3d189d98f23d0f8d23e496ea
-  # Author: Andrew Kelley <andrew@ziglang.org>
-  # Date:   2022-11-01T05:29:55+02:00
-  #
-  #     remove `-fstage1` option
-  #
-  #     After this commit, the self-hosted compiler does not offer the option to
-  #     use stage1 as a backend anymore.
-  local REMOVE_FSTAGE1=0.10.0-539-g28514476ef
   git revert --no-edit -X theirs $REMOVE_FSTAGE1
 
   git mv stage1/config.zig.in src
@@ -75,18 +114,7 @@ step00() {
 }
 
 step10() {
-  cat <<EOF
-   This commit:
-
-   commit 9d93b2ccf11f584320a2c5209dd2d94705167695
-   Author: Veikka Tuominen <git@vexu.eu>
-   Date:   2022-12-08T17:52:05+00:00
-  
-       Eliminate \$(BoundFn) type from the language
-  
-       Closes #9484
-EOF
-  local BOUNDFN=0.10.0-675-g9d93b2ccf1
+  echo "Generating zig1.wasm.zst for $BOUNDFN"
   git archive --prefix=zig-$BOUNDFN/ $BOUNDFN | tar -C .. -x --exclude="stage1/zig1.wasm*"
 
   {
@@ -107,9 +135,53 @@ EOF
 }
 
 step20() {
-  true
+  echo "Generating zig1.wasm.zst for $C_AARCH64"
+  git archive --prefix=zig-$C_AARCH64/ $C_AARCH64 | tar -C .. -x --exclude="stage1/zig1.wasm*"
+
+  {
+    pushd "../zig-$C_AARCH64"
+    zstd -cd ../zig-$BOUNDFN/stage1/zig1.wasm.zst >stage1/zig1.wasm
+    mkdir build
+    {
+      pushd build
+      CC=clang-15 CXX=clang++-15 cmake ..
+      make -j"$(nproc)" install
+      popd
+    }
+    build/stage3/bin/zig build update-zig1
+    popd
+  }
+  echo "zig1.wasm.zst was built for C-aarch64 backend"
 }
 
-step00
-step10
-step20
+generic() {
+  local FROM="$1"
+  local TO="$2"
+
+  echo "Updating zig1.wasm from $FROM -> $TO in ../zig-$TO"
+  git archive --prefix="zig-$TO/" "$TO" | tar -C .. -x --exclude="stage1/zig1.wasm"
+
+  {
+    pushd "../zig-$TO"
+    cp "../zig-$FROM/stage1/zig1.wasm" stage1/
+    mkdir build
+    {
+      pushd build
+      CC=clang-15 CXX=clang++-15 cmake ..
+      make -j"$(nproc)" install
+      popd
+    }
+    build/stage3/bin/zig build update-zig1
+    popd
+  }
+  echo "zig1.wasm updated for $TO"
+}
+
+if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
+  set -xeuo pipefail
+  step00
+  step10
+  step20
+  generic "$C_AARCH64" "$CALL_CHANGES"
+  generic "$CALL_CHANGES" "$BUILTIN_TYPE"
+fi