CI Updates

.github/workflows/ci.yml

@@ -12,12 +12,24 @@ env:
     RUSTFLAGS: -Dwarnings
 
 jobs:
+    init:
+        name: Initialize the common variables
+        runs-on: ubuntu-latest
+        outputs:
+          msrv: ${{ step.rust.outputs.msrv }}
+          matrix: ${{ step.matrix.outputs.value }}
+        steps:
+          - id: rust
+            run: echo "::set-output name=msrv::${$(cat Cargo.toml | grep rust-version | tr -d '\"'):2:3}"
+          - id: matrix
+            run: echo "::set-output name=value::{\"rust\":[\"1.58.1\", \"nightly\", \"stable\"]}"
+
     test:
         name: Test on rust ${{matrix.rust}}
         runs-on: ubuntu-latest
+        needs: init
         strategy:
-            matrix:
-                rust: [1.58.1, stable, nightly]
+            matrix: ${{fromJSON(needs.init.outputs.matrix)}}
         steps:
         - uses: actions/checkout@v2
         - uses: dtolnay/rust-toolchain@master
@@ -32,7 +44,10 @@ jobs:
         - uses: actions/checkout@v2
         - uses: dtolnay/rust-toolchain@nightly
         - run: rustup component add clippy
-        - run: cargo clippy --all
+        # Suppress the warning generated by derive_partial_eq_without_eq lint.
+        # This warning appears with the nightly toolchain.
+        # Please, also see this GitHub issue: https://github.com/rust-lang/rust-clippy/issues/9063
+        - run: cargo clippy --all -- -A clippy::derive_partial_eq_without_eq
 
     fmt:
         name: Rustfmt