ci: check docs (#356)

* ci: check docs

* fix: unused variable warning on wasm

Author: Stebalien

.github/workflows/ci.yml

@@ -9,6 +9,7 @@ on:
 env:
   CARGO_TARGET_WASM32_WASIP1_RUNNER: "/home/runner/.wasmtime/bin/wasmtime --dir /tmp/"
   CARGO_TARGET_WASM32_WASIP2_RUNNER: "/home/runner/.wasmtime/bin/wasmtime --dir /tmp/"
+  RUSTFLAGS: "-D warnings"
 
 name: CI
 jobs:
@@ -88,7 +89,7 @@ jobs:
       - name: Build
         run: cargo build --target wasm32-unknown-unknown
   lint:
-    name: Clippy and fmt
+    name: Clippy, fmt, and docs
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -99,5 +100,9 @@ jobs:
           components: clippy, rustfmt
       - name: Check formatting
         run: cargo fmt --check
+      - name: Check documentation
+        run: cargo doc --all --no-deps
+      - name: Check for clippy lints
+        run: cargo clippy
       - name: Check for clippy lints
         run: cargo clippy

src/util.rs

@@ -62,6 +62,8 @@ pub fn create_helper<R>(
                 rng.seed(seed);
             }
         }
+        let _ = i; // avoid unused variable warning for the above.
+
         let path = base.join(tmpname(&mut rng, prefix, suffix, random_len));
         return match f(path) {
             Err(ref e) if e.kind() == io::ErrorKind::AlreadyExists && num_retries > 1 => continue,