diff --git a/rust-version b/rust-version
index a5ba2d9a61..71bc3b30f4 100644
--- a/rust-version
+++ b/rust-version
@@ -1 +1 @@
-38aa6bdfd705ea0604d7d5dd9fabc5e8f853a4fc
+0ec370670220b712b042ee09aab067ec7e5878d5
diff --git a/tests/run-pass/c_enums.rs b/tests/run-pass/c_enums.rs
index 16b795342e..5c2cecb330 100644
--- a/tests/run-pass/c_enums.rs
+++ b/tests/run-pass/c_enums.rs
@@ -1,3 +1,5 @@
+#![allow(const_err)] // don't warn about truncating casts
+
 enum Foo {
     Bar = 42,
     Baz,