Modify CI to run directed-minimal-versions (#41)

`-Zdirected-minimal-versions` will run with the minimal versions of the
specified direct dependencies (of rune and all workspace crates), but
the maximum indirect dependencies. This means that we won't fail CI for
any issues our direct deps have with `-Zminimal-versions`.

Additionally, fixed some of the versions that were selected for syn,
quote and proc-macro2. It's recommended to use qualified versions, to
avoid issues with minimal versions.

.github/workflows/test.yml

@@ -65,8 +65,6 @@ jobs:
     # Cargo build order. See also
     # https://github.com/jonhoo/fantoccini/blob/fde336472b712bc7ebf5b4e772023a7ba71b2262/Cargo.toml#L47-L49.
     # This action is run on ubuntu with the stable toolchain, as it is not expected to fail
-    # disable this job until we can fix it.
-    if: false
     runs-on: ubuntu-latest
     name: ubuntu / stable / minimal-versions
     steps:
@@ -77,14 +75,14 @@ jobs:
         run: sudo apt-get -y install libpango1.0-dev libgtk-3-dev
       - name: Install stable
         uses: dtolnay/rust-toolchain@stable
-      - name: Install nightly for -Zminimal-versions
+      - name: Install nightly for -Zdirected-minimal-versions
         uses: dtolnay/rust-toolchain@nightly
       - name: rustup default stable
         run: rustup default stable
-      - name: cargo update -Zminimal-versions
-        run: cargo +nightly update -Zminimal-versions
-      - name: cargo test
-        run: cargo test --workspace --locked --all-features
+      - uses: taiki-e/install-action@cargo-hack
+      - uses: taiki-e/install-action@cargo-minimal-versions
+      - name: Check directed-minimal-versions
+        run: cargo minimal-versions check --direct
   os-check:
     # run cargo test on mac and windows
     runs-on: ${{ matrix.os }}

Cargo.toml

@@ -51,9 +51,9 @@ default = []
 debug_bytecode = []
 
 [build-dependencies]
-syn = "2.0" 
-quote = "1.0"
-proc-macro2 = "1.0"
+syn = "2.0.15"
+quote = "1.0.26"
+proc-macro2 = "1.0.60"
 
 [workspace.lints.rust]
 macro_use_extern_crate = "deny"

fn_macros/Cargo.toml

@@ -9,10 +9,10 @@ path = "lib.rs"
 proc-macro = true
 
 [dependencies]
-quote = "1.0"
+quote = "1.0.26"
 darling = "0.20"
-syn = { version = "2.0", features = ["full"]}
-proc-macro2 = "1.0"
+syn = { version = "2.0.15", features = ["full"]}
+proc-macro2 = "1.0.60"
 
 [lints]
 workspace = true