ci: reinstate coverage

.github/workflows/coverage.yml

@@ -1,5 +1,3 @@
-# disabled because `cargo tarpaulin` currently segfaults
-
 name: Coverage
 
 on:
@@ -14,21 +12,25 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  # job currently (1st Feb 2022) segfaults
   coverage:
-    name: coverage
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
+      - name: Install Rust
+        uses: actions-rust-lang/setup-rust-toolchain@v1.5.0
+        with:
+          components: llvm-tools-preview
 
-      - uses: actions-rust-lang/setup-rust-toolchain@v1
-        with: { toolchain: nightly }
+      - name: Install cargo-llvm-cov
+        uses: taiki-e/install-action@v2.13.4
+        with:
+          tool: cargo-llvm-cov
 
-      - name: Generate coverage file
-        run: |
-          cargo install cargo-tarpaulin --vers "^0.13"
-          cargo tarpaulin --workspace --features=rustls,openssl --out Xml --verbose
-      - name: Upload to Codecov
+      - name: Generate code coverage
+        run: cargo llvm-cov --workspace --all-features --codecov --output-path codecov.json
+
+      - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v3.1.4
         with:
-          file: cobertura.xml
+          files: codecov.json
+          fail_ci_if_error: true

.gitignore

@@ -19,3 +19,6 @@ guide/build/
 
 # Configuration directory generated by VSCode
 .vscode
+
+# code coverage
+/codecov.json

awc/src/client/connection.rs

@@ -441,7 +441,7 @@ mod test {
                             }
                         }
                     }
-                    Err(err) => Poll::Ready(()),
+                    Err(_) => Poll::Ready(()),
                 }
             }
         }