From f91631174498498c134dbeb2baff0219dfeb7ceb Mon Sep 17 00:00:00 2001
From: Michael Tang <tangmi@uw.edu>
Date: Thu, 31 Oct 2019 09:45:12 -0700
Subject: [PATCH] Add error message when building for web without selecting a
 feature. (#1253)

---
 src/platform_impl/web/mod.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/platform_impl/web/mod.rs b/src/platform_impl/web/mod.rs
index 44d4fc19..029761b9 100644
--- a/src/platform_impl/web/mod.rs
+++ b/src/platform_impl/web/mod.rs
@@ -16,6 +16,9 @@ mod backend;
 #[path = "stdweb/mod.rs"]
 mod backend;
 
+#[cfg(not(any(feature = "web-sys", feature = "stdweb")))]
+compile_error!("Please select a feature to build for web: `web-sys`, `stdweb`");
+
 pub use self::device::Id as DeviceId;
 pub use self::error::OsError;
 pub use self::event_loop::{