Check-in pregenerated WASIp2/3 bindings

.github/regenerate-wasi-bindings.sh

@@ -0,0 +1,51 @@
+# Helper script executed from CI to execute `wit-bindgen` and regenerate the
+# bindings for the WASIp2 and WASIp3 targets.
+
+set -ex
+
+# Disable some features required for compat with really old toolchains/WASI
+# versions that aren't required here.
+args="--disable-custom-section-link-helpers"
+args="$args --disable-run-ctors-once-workaround"
+
+# Make the generated code a bit easier to read
+args="$args --format"
+
+# Use `feature = "std"` if needed, mostly intended for future compat if ever
+# since this isn't needed currently.
+args="$args --std-feature"
+
+# Fail to compile if a runtime-path is actually needed, and it shouldn't be
+# given the current generated bindings.
+args="$args --runtime-path nonexisten"
+
+# The custom section generated by wit-bindgen needs a globally unique version in
+# the entire crate graph, so "salt" it with the `rand` crate's version which
+# should be sufficient enough for now.
+rand_version=$(cat Cargo.toml | grep '^version' | sed 's/version = "\(.*\)"/\1/')
+args="$args --type-section-suffix rust-rand-${rand_version}"
+
+# Skip generated bindings for functions that this crate doesn't use.
+args="$args --skip=get-random-bytes"
+args="$args --skip=get-insecure-random-bytes"
+args="$args --skip=get-insecure-random-u64"
+args="$args --skip=get-insecure-seed"
+
+# WASIp2 bindings
+wasip2=0.2.10
+curl -LO https://github.com/WebAssembly/WASI/releases/download/v$wasip2/wasi-wit-$wasip2.tar.gz
+tar xf wasi-wit-$wasip2.tar.gz
+wit-bindgen rust $args ./wasi-wit-$wasip2/random \
+  --world imports \
+  --out-dir src/backends/wasi_p2_3/p2
+
+# WASIp3 bindings
+#
+# Note that the folder structure is a bit different for WASIp2 for now, but it's
+# expected to converge on the same structure as WASIp2 above eventually.
+wasip3=0.3.0-rc-2026-01-06
+curl -LO https://github.com/WebAssembly/WASI/archive/refs/tags/v$wasip3.tar.gz
+tar xf v$wasip3.tar.gz
+wit-bindgen rust $args ./WASI-$wasip3/proposals/random/wit-0.3.0-draft \
+  --world imports \
+  --out-dir src/backends/wasi_p2_3/p3

.github/workflows/tests.yml

@@ -391,14 +391,9 @@ jobs:
           wget -O - $URL | tar -xJ --strip-components=1 -C ~/.cargo/bin
           wasmtime --version
       - uses: Swatinem/rust-cache@v2
-      # TODO(MSRV-1.87): Remove this step.
-      - name: Generate MSRV-compatible Cargo.lock
-        env:
-          CARGO_RESOLVER_INCOMPATIBLE_RUST_VERSIONS: "fallback"
-        run: cargo update -p wasip2
       - run: cargo test --target wasm32-wasip2
 
-  # TODO: enable after pre-built std will be provided by Rust 
+  # TODO: enable after pre-built std will be provided by Rust
   # wasi_p3:
   #   name: WASIp3
   #   runs-on: ubuntu-24.04
@@ -416,3 +411,19 @@ jobs:
   #         wasmtime --version
   #     - uses: Swatinem/rust-cache@v2
   #     - run: cargo test --target wasm32-wasip3
+
+  wasi_bindings:
+    name: WASI bindings up-to-date
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v6
+      - name: Install wit-bindgen
+        run: |
+          VERSION=0.53.1
+          URL=https://github.com/bytecodealliance/wit-bindgen/releases/download/v${VERSION}/wit-bindgen-${VERSION}-x86_64-linux.tar.gz
+          wget -O - $URL | tar -xz --strip-components=1 -C ~/.cargo/bin
+          wit-bindgen --version
+      - name: Generate bindings
+        run: sh .github/regenerate-wasi-bindings.sh
+      - name: Ensure generated files up-to-date
+        run: git diff --exit-code

.typos.toml

@@ -1,6 +1,7 @@
 [files]
 extend-exclude = [
-    ".git/"
+    ".git/",
+    "src/backends/wasi_p2_3",
 ]
 
 [default.extend-words]