Run clippy in CI (#2443)

* Run clippy in CI

* Fix clippy warnings in build output

* Update PR template

.github/PULL_REQUEST_TEMPLATE.md

@@ -2,16 +2,18 @@
 
 2. [ ] Make sure that the changes are covered by unit-tests.
 
-3. [ ] Run `cargo +nightly fmt` on the changes.
+3. [ ] Run `cargo clippy` on the changes.
 
-4. [ ] Please put changelog entries **in the description of this Pull Request**
+4. [ ] Run `cargo +nightly fmt` on the changes.
+
+5. [ ] Please put changelog entries **in the description of this Pull Request**
    if knowledge of this change could be valuable to users. No need to put the
    entries to the changelog directly, they will be transferred to the changelog
    file by maintainers right after the Pull Request merge.
 
    Please remove any items from the template below that are not applicable.
 
-5. [ ] Describe in common words what is the purpose of this change, related
+6. [ ] Describe in common words what is the purpose of this change, related
    Github Issues, and highlight important implementation aspects.
 
 Changelog:

.github/workflows/rust.yml

@@ -51,11 +51,19 @@ jobs:
       run: |
         cd examples
         cargo build --verbose
+  clippy:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - name: Run clippy check
+      run: |
+        rustup component add clippy
+        cargo clippy -- -Dwarnings
   fmt:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
-    - name: Check formatting
+    - name: Run fmt check
       run: |
         rustup toolchain install nightly --component rustfmt
         cargo +nightly fmt --check

vulkano/autogen/extensions.rs

@@ -254,11 +254,16 @@ fn device_extensions_output(members: &[ExtensionsMember]) -> TokenStream {
                                 }
                             }
                         },
-                    );
+                    )
+                    .collect::<Vec<_>>();
 
-                quote! {
-                    if self.#name {
-                        #(#requires_all_of_items)*
+                if requires_all_of_items.is_empty() {
+                    quote! {}
+                } else {
+                    quote! {
+                        if self.#name {
+                            #(#requires_all_of_items)*
+                        }
                     }
                 }
             },