CI: Run cargo clippy for wasm32-unknown-unknown (#2200)

* CI: Run cargo clippy for wasm32-unknown-unknown

* wasm32 clippy fixes

* Document when AppRunner::new can fail

.github/workflows/rust.yml

@@ -74,7 +74,7 @@ jobs:
         uses: actions-rs/cargo@v1
         with:
           command: cranky
-          args: --all-targets --all-features --  -D warnings
+          args: --all-targets --all-features -- -D warnings
 
   check_wasm:
     name: Check wasm32 + wasm-bindgen
@@ -87,30 +87,48 @@ jobs:
           toolchain: 1.61.0
           target: wasm32-unknown-unknown
           override: true
+
       - run: sudo apt-get update && sudo apt-get install libgtk-3-dev
+
       - name: Set up cargo cache
         uses: Swatinem/rust-cache@v2
+
+      - name: Install cargo-cranky
+        uses: baptiste0928/cargo-install@v1
+        with:
+          crate: cargo-cranky
+
       - name: Check wasm32 egui_demo_app
         uses: actions-rs/cargo@v1
         with:
           command: check
           args: -p egui_demo_app --lib --target wasm32-unknown-unknown
+
       - name: Check wasm32 egui_demo_app --all-features
         uses: actions-rs/cargo@v1
         with:
           command: check
           args: -p egui_demo_app --lib --target wasm32-unknown-unknown --all-features
+
       - name: Check wasm32 eframe
         uses: actions-rs/cargo@v1
         with:
           command: check
           args: -p eframe --lib --no-default-features --features glow,persistence --target wasm32-unknown-unknown
+
       - name: wasm-bindgen
         uses: jetli/wasm-bindgen-action@v0.1.0
         with:
           version: "0.2.83"
+
       - run: ./sh/wasm_bindgen_check.sh --skip-setup
 
+      - name: Cranky wasm32
+        uses: actions-rs/cargo@v1
+        with:
+          command: cranky
+          args: --target wasm32-unknown-unknown --all-features -p egui_demo_app --lib -- -D warnings
+
   cargo-deny:
     name: cargo deny
     runs-on: ubuntu-latest