suite: update Rust to pull in -Zembed-source fixes

Author: baflor

harness-suite/projects-rust/libzstd-rs-sys/prepare.sh

@@ -1,2 +1,2 @@
 set -e
-git clone-rev.sh https://github.com/trifectatechfoundation/libzstd-rs-sys "$PROJECT/repo" 536f7b3017c07b9ab924af6ae1dcdb4b4ab0ef3d
+git clone-rev.sh https://github.com/trifectatechfoundation/libzstd-rs-sys "$PROJECT/repo" 3dc8c859efb1eb7264631c4781e1d811a5bcc8fb

harness-suite/scripts/build-rust-harness.py

@@ -21,7 +21,7 @@
 BUILD_TYPE = os.environ.get("BUILD_TYPE", "wasi-lime1")
 assert BUILD_TYPE in ["wasi-lime1", "wasi-mvp", "x86_64-libfuzzer", "x86_64-libafl"]
 BUILD_FLAGS = os.environ.get("BUILD_FLAGS", "").split(";")
-RUSTUP_TOOLCHAIN = "nightly-2026-01-03"
+RUSTUP_TOOLCHAIN = "nightly-2026-05-02"
 WASI_SYSROOT = "/wasi-sdk/share/wasi-sysroot/"
 CARGO = Path.home() / ".cargo" / "bin" / "cargo"
 os.environ["RUSTUP_TOOLCHAIN"] = RUSTUP_TOOLCHAIN

harness-suite/scripts/set-buildflags.sh

@@ -4,10 +4,10 @@ export WASI_SDK_PREFIX=/wasi-sdk/
 
 case $BUILD_TYPE in
     wasi-lime1)
-        TARGET_FLAGS="--sysroot=$WASI_SDK_PREFIX/share/wasi-sysroot --target=wasm32-wasi -mcpu=lime1"
+        TARGET_FLAGS="--sysroot=$WASI_SDK_PREFIX/share/wasi-sysroot --target=wasm32-wasip1 -mcpu=lime1"
         ;;
     wasi-mvp)
-        TARGET_FLAGS="--sysroot=$WASI_SDK_PREFIX/share/wasi-sysroot --target=wasm32-wasi -mcpu=mvp"
+        TARGET_FLAGS="--sysroot=$WASI_SDK_PREFIX/share/wasi-sysroot --target=wasm32-wasip1 -mcpu=mvp"
         ;;
     x86_64-libfuzzer|x86_64-libafl)
         TARGET_FLAGS=""