Fix cargo run -p egui_demo_app (#1343)

Broken by https://github.com/emilk/egui/pull/1303

.github/workflows/rust.yml

@@ -56,6 +56,19 @@ jobs:
           command: check
           args: -p egui_demo_app --lib --target wasm32-unknown-unknown
 
+  check_egui_demo_app:
+    name: cargo check -p egui_demo_app
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: 1.56.0
+          override: true
+      - name: check
+        run: cargo check -p egui_demo_app
+
   check_wasm_eframe_with_features:
     name: cargo check wasm eframe
     runs-on: ubuntu-20.04

egui_glow/src/lib.rs

@@ -100,15 +100,8 @@ pub mod winit;
 #[cfg(all(not(target_arch = "wasm32"), feature = "winit"))]
 pub use winit::*;
 
-#[cfg(all(
-    not(target_arch = "wasm32"),
-    feature = "persistence",
-    feature = "winit"
-))]
+#[cfg(all(not(target_arch = "wasm32"), feature = "winit"))]
 mod epi_backend;
-#[cfg(all(
-    not(target_arch = "wasm32"),
-    feature = "persistence",
-    feature = "winit"
-))]
+
+#[cfg(all(not(target_arch = "wasm32"), feature = "winit"))]
 pub use epi_backend::{run, NativeOptions};

sh/check.sh

@@ -37,6 +37,7 @@ cargo doc --document-private-items --no-deps --all-features
 
 (cd eframe && cargo check --all-features)
 (cd egui && cargo check --all-features)
+(cd egui_demo_app && cargo check --all-features)
 (cd egui_extras && cargo check --all-features)
 (cd egui_glium && cargo check --all-features)
 (cd egui_glow && cargo check --all-features)