Check minimal versions more precisely

Author: tottoto

.github/workflows/CI.yml

@@ -61,10 +61,6 @@ jobs:
         run: ./ci/h2spec.sh
         if: matrix.rust == 'stable'
 
-      - name: Check minimal versions
-        run: cargo clean; cargo update -Zminimal-versions; cargo check
-        if: matrix.rust == 'nightly'
-
   clippy_check:
     runs-on: ubuntu-latest
     steps:
@@ -83,14 +79,19 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Get MSRV from package metadata
-        id: metadata
-        run: |
-          cargo metadata --no-deps --format-version 1 |
-              jq -r '"msrv=" + (.packages[] | select(.name == "h2")).rust_version' >> $GITHUB_OUTPUT
+        id: msrv
+        run: grep rust-version Cargo.toml | cut -d '"' -f2 | sed 's/^/version=/' >> $GITHUB_OUTPUT
 
       - name: Install Rust (${{ steps.metadata.outputs.msrv }})
+        id: msrv-toolchain
         uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: ${{ steps.metadata.outputs.msrv }}
+          toolchain: ${{ steps.msrv.outputs.version }}
 
       - run: cargo check -p h2
+
+      - uses: dtolnay/rust-toolchain@nightly
+      - uses: taiki-e/install-action@cargo-hack
+      - uses: taiki-e/install-action@cargo-minimal-versions
+
+      - run: cargo +${{ steps.msrv-toolchain.outputs.name }} minimal-versions check

Cargo.toml

@@ -48,7 +48,7 @@ tokio-util = { version = "0.7.1", features = ["codec"] }
 tokio = { version = "1", features = ["io-util"] }
 bytes = "1"
 http = "0.2"
-tracing = { version = "0.1.21", default-features = false, features = ["std"] }
+tracing = { version = "0.1.32", default-features = false, features = ["std"] }
 fnv = "1.0.5"
 slab = "0.4.2"
 indexmap = { version = "1.5.2", features = ["std"] }