fix: restore the wasm build on the current toolchain

.github/workflows/ci.yml

@@ -11,5 +11,10 @@ jobs:
         with:
           toolchain: stable
           components: clippy
+      # Run inside the checkout so the `rust-toolchain` override decides which
+      # toolchain gets the targets.
+      - run: rustup target add wasm32-unknown-unknown wasm32-wasip1
       - run: cargo check
       - run: cargo build -p app
+      - run: cargo build -p wasm --release --target wasm32-unknown-unknown
+      - run: cargo build -p wasi --release --target wasm32-wasip1

README.md

@@ -28,8 +28,8 @@ The terminal is put into raw mode while the emulator runs, so every keystroke in
 ## WASI
 
 ```sh
-$ cargo build -p wasi --target wasm32-wasi --release
-$ wasmtime ./target/wasm32-wasi/release/wasi.wasm
+$ cargo build -p wasi --target wasm32-wasip1 --release
+$ wasmtime ./target/wasm32-wasip1/release/wasi.wasm
 ```
 
 ## Wasm

wasm/src/lib.rs

@@ -1,5 +1,8 @@
 use core::bus::RAM_START;
 
+// Rust 1.82 stopped turning undefined symbols into `env` imports implicitly,
+// so the module has to be named for the host functions worker.js provides.
+#[link(wasm_import_module = "env")]
 extern "C" {
     fn elapsed_us() -> usize;
     fn tx(s: u32);