ci: Check compilation with -Zminimal-versions

.github/workflows/test.yml

@@ -72,10 +72,13 @@ jobs:
           cargo +stable update
       - uses: taiki-e/install-action@v2
         with:
-          tool: cargo-hack,cargo-nextest
+          tool: cargo-hack,cargo-nextest,cargo-minimal-versions
       - name: Test (${{ matrix.rust }}, ${{ matrix.feature_flags }}})
         run: |
           cargo hack ${{ matrix.feature_flags }} nextest run --no-tests=pass
+      - name: Check -Zminimal-versions (${{ matrix.rust }}, ${{ matrix.feature_flags }}})
+        run: |
+          cargo hack ${{ matrix.feature_flags }} minimal-versions check
 
   clippy:
     # Only run on PRs if the source branch is on someone else's repo

Cargo.toml

@@ -24,6 +24,10 @@ intid-derive = { path  = "intid-derive", version = "0.3.2" }
 intid-core = { path = "intid-core", version = "0.3.2"}
 intid = { path  = "intid", version = "0.3.2" }
 
+# bytemuck 1.14 - adds `align_offset` feature
+# bytemuck 1.19 - adds `track_caller` feature
+bytemuck = "1.19"
+
 [workspace.lints.rust]
 missing-docs = "deny"
 unsafe-op-in-unsafe-fn = "deny"

intid-allocator/Cargo.toml

@@ -25,7 +25,7 @@ keywords = [
 
 [dependencies]
 atomic = {  version = "0.6", optional = true }
-bytemuck = { version = "1", optional = true }
+bytemuck = { workspace = true, optional = true }
 rustversion = "1"
 
 [dependencies.intid]

intid-core/Cargo.toml

@@ -14,7 +14,7 @@ keywords = ["intid", "id", "counter", "idmap", "integer"]
 [dependencies]
 num-traits = { version = "0.2", optional = true }
 nonmax = { version = "0.5", optional = true }
-bytemuck = { version = "1", optional = true }
+bytemuck = { workspace = true, optional = true }
 
 [features]
 default = ["std"]

intid-derive/src/analyze.rs

@@ -331,7 +331,8 @@ pub fn determine_repr(input: &DeriveInput) -> Result<Option<Repr>, syn::Error> {
                 if result.is_some() {
                     return Err(meta.error("Encountered multiple repr(...) attributes"));
                 }
-                let ident = meta.path.require_ident()?;
+                let unknown_repr = || syn::Error::new(meta.path.span(), "Unknown #[repr])");
+                let ident = meta.path.get_ident().ok_or_else(unknown_repr)?;
                 let s = ident.to_string();
                 result = Some(match &*s {
                     "C" => Repr::C(ident.span()),
@@ -343,7 +344,7 @@ pub fn determine_repr(input: &DeriveInput) -> Result<Option<Repr>, syn::Error> {
                             ..int
                         })
                     }
-                    _ => return Err(syn::Error::new(meta.path.span(), "Unknown #[repr])")),
+                    _ => return Err(unknown_repr()),
                 });
                 Ok(())
             })?;