diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 977f90d3f96..8d6ec65f24e 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -11,6 +11,12 @@ jobs:
       - template: ci/azure-install-rust.yml
       - script: cargo fmt --all -- --check
 
+  - job: cargo_check
+    displayName: "Run cargo check"
+    steps:
+      - template: ci/azure-install-rust.yml
+      - script: cargo check --all
+
   - job: test_wasm_bindgen
     displayName: "Run wasm-bindgen crate tests (unix)"
     steps:
diff --git a/examples/guide-supported-types-examples/Cargo.toml b/examples/guide-supported-types-examples/Cargo.toml
index 5eb4a92a522..7936416f168 100644
--- a/examples/guide-supported-types-examples/Cargo.toml
+++ b/examples/guide-supported-types-examples/Cargo.toml
@@ -9,3 +9,4 @@ crate-type = ["cdylib"]
 
 [dependencies]
 wasm-bindgen = "0.2.74"
+js-sys = "0.3.51"
diff --git a/examples/guide-supported-types-examples/src/imported_types.rs b/examples/guide-supported-types-examples/src/imported_types.rs
index 39d20d6b82f..1f0c390a8fc 100644
--- a/examples/guide-supported-types-examples/src/imported_types.rs
+++ b/examples/guide-supported-types-examples/src/imported_types.rs
@@ -1,6 +1,7 @@
 use wasm_bindgen::prelude::*;
 
 #[wasm_bindgen]
+#[derive(Copy, Clone, Debug)]
 pub enum NumberEnum {
     Foo = 0,
     Bar = 1,
@@ -8,6 +9,7 @@ pub enum NumberEnum {
 }
 
 #[wasm_bindgen]
+#[derive(Copy, Clone, Debug)]
 pub enum StringEnum {
     Foo = "foo",
     Bar = "bar",
diff --git a/examples/webxr/src/lib.rs b/examples/webxr/src/lib.rs
index de3c3f5df3d..7bc95d0e09e 100644
--- a/examples/webxr/src/lib.rs
+++ b/examples/webxr/src/lib.rs
@@ -1,3 +1,5 @@
+#![cfg(web_sys_unstable_apis)]
+
 #[macro_use]
 mod utils;