ci: Fix MSRV build by precisely specifying some deps. (#731)

* ci: Fix MSRV build by precisely specifying some deps.

* ci: Don't fail fast if one Rust version fails.

* clippy: Fix `unwrap_or_default` lint.

.github/workflows/ci.yaml

@@ -15,6 +15,7 @@ jobs:
   ci:
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
         rust:
           - stable
@@ -33,6 +34,14 @@ jobs:
       - uses: Swatinem/rust-cache@v2
         name: Load dependencies from cache
 
+      - name: Fix dep versions for MSRV
+        if: ${{ matrix.rust == '1.64.0' }}
+        run: |
+          cargo update -p clap --precise 4.3.24 # 4.4 moves to msrv 1.70
+          cargo update -p clap_lex --precise 0.5.0 # 0.5.1 moves to msrv 1.70 in a patch release
+          cargo update -p anstyle --precise 1.0.2 # 1.0.3 moves to msrv 1.70 in a patch release
+          cargo update -p regex --precise 1.9.6 # 1.10 moves to msrv 1.65
+
       - name: Build with stable features
         run: cargo build --features stable
 

src/html/mod.rs

@@ -530,10 +530,7 @@ impl Report for Html {
         // Group IDs by group id
         let mut id_groups: HashMap<&str, Vec<&BenchmarkId>> = HashMap::new();
         for id in found_ids.iter() {
-            id_groups
-                .entry(&id.group_id)
-                .or_insert_with(Vec::new)
-                .push(id);
+            id_groups.entry(&id.group_id).or_default().push(id);
         }
 
         let mut groups = id_groups