Unpin toolchain and only evaluate coverage if the basic jobs are successful.

Author: adamreichold

.github/workflows/ci.yml

@@ -165,6 +165,7 @@ jobs:
 
   coverage:
     runs-on: ubuntu-latest
+    needs: [lint, check-msrv, examples]
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python
@@ -178,9 +179,7 @@ jobs:
         continue-on-error: true
       - uses: actions-rs/toolchain@v1
         with:
-          # TODO: this is pinned to work around a rustc bug in instrumented coverage
-          # https://github.com/taiki-e/cargo-llvm-cov/issues/128
-          toolchain: nightly-2022-01-14
+          toolchain: nightly
           override: true
           profile: minimal
           components: llvm-tools-preview