Make benchmark work with act, and fix import

This doesn't remedy a certain benchmark's possible memory consumption.

.github/workflows/cron-ci.yaml

@@ -124,6 +124,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
       - run: cargo install cargo-criterion
       - name: build benchmarks
         run: cargo build --release --benches

benches/microbenchmarks.rs

@@ -114,7 +114,13 @@ fn bench_rustpy_code(group: &mut BenchmarkGroup<WallTime>, bench: &MicroBenchmar
     settings.dont_write_bytecode = true;
     settings.no_user_site = true;
 
-    Interpreter::new(settings, InitParameter::External).enter(|vm| {
+    Interpreter::new_with_init(settings, |vm| {
+        for (name, init) in rustpython_stdlib::get_module_inits().into_iter() {
+            vm.add_native_module(name, init);
+        }
+        InitParameter::External
+    })
+    .enter(|vm| {
         let setup_code = vm
             .compile(&bench.setup, Mode::Exec, bench.name.to_owned())
             .expect("Error compiling setup code");