Add libmimalloc-sys-test to CI, and verify that documentation links resolve in CI

Author: Thom Chiovoloni

.github/workflows/ci.yml

@@ -58,6 +58,12 @@ jobs:
           command: test
           args: --no-default-features
 
+      - name: Test libmimalloc-sys crate bindings.
+        uses: actions-rs/cargo@v1
+        with:
+          command: run
+          args: -p libmimalloc-sys-test
+
   lint:
     name: Rustfmt / Clippy
     runs-on: ubuntu-latest
@@ -84,3 +90,36 @@ jobs:
         with:
           command: clippy
           args: --workspace -- -D warnings
+
+  # Detect cases where documentation links would be dead
+  doc:
+    name: Check documentation
+    runs-on: ubuntu-latest
+    steps:
+
+      - uses: actions/checkout@v2
+        with:
+          submodules: recursive
+
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly
+          override: true
+
+      # Note: We need to use nightly rust, and `cargo rustdoc` (yes, not `cargo
+      # doc`) to actually get it to respect -D warnings... Using nightly also
+      # gets us the nicer syntax for linking to functions, and is in-line with
+      # what docs.rs uses.
+
+      - name: 'Check documentation links in `mimalloc`'
+        uses: actions-rs/cargo@v1
+        with:
+          command: rustdoc
+          args: -- -D warnings
+
+      - name: 'Check documentation links in `libmimalloc-sys`'
+        uses: actions-rs/cargo@v1
+        with:
+          command: rustdoc
+          args: -p libmimalloc-sys -- -D warnings