1 files changed, 35 insertions, 0 deletions
diff --git a/src/test/ui/dropck/dropck-eyepatch-implies-unsafe-impl.rs b/src/test/ui/dropck/dropck-eyepatch-implies-unsafe-impl.rs
new file mode 100644
index 000000000..6869ab1c4
--- /dev/null
+++ b/src/test/ui/dropck/dropck-eyepatch-implies-unsafe-impl.rs
@@ -0,0 +1,35 @@
+#![feature(dropck_eyepatch)]
+
+// This test ensures that a use of `#[may_dangle]` is rejected if
+// it is not attached to an `unsafe impl`.
+
+use std::fmt;
+
+struct Dt<A: fmt::Debug>(&'static str, A);
+struct Dr<'a, B:'a+fmt::Debug>(&'static str, &'a B);
+struct Pt<A,B: fmt::Debug>(&'static str, A, B);
+struct Pr<'a, 'b, B:'a+'b+fmt::Debug>(&'static str, &'a B, &'b B);
+struct St<A: fmt::Debug>(&'static str, A);
+struct Sr<'a, B:'a+fmt::Debug>(&'static str, &'a B);
+
+impl<A: fmt::Debug> Drop for Dt<A> {
+    fn drop(&mut self) { println!("drop {} {:?}", self.0, self.1); }
+}
+impl<'a, B: fmt::Debug> Drop for Dr<'a, B> {
+    fn drop(&mut self) { println!("drop {} {:?}", self.0, self.1); }
+}
+impl<#[may_dangle] A, B: fmt::Debug> Drop for Pt<A, B> {
+    //~^ ERROR requires an `unsafe impl` declaration due to `#[may_dangle]` attribute
+
+    // (unsafe to access self.1  due to #[may_dangle] on A)
+    fn drop(&mut self) { println!("drop {} {:?}", self.0, self.2); }
+}
+impl<#[may_dangle] 'a, 'b, B: fmt::Debug> Drop for Pr<'a, 'b, B> {
+    //~^ ERROR requires an `unsafe impl` declaration due to `#[may_dangle]` attribute
+
+    // (unsafe to access self.1 due to #[may_dangle] on 'a)
+    fn drop(&mut self) { println!("drop {} {:?}", self.0, self.2); }
+}
+
+fn main() {
+}