Added diagnostic for pin! macro in addition to Box::pin if Unpin isn't implemented

1 files changed, 23 insertions, 0 deletions

diff --git a/tests/ui/suggestions/suggest-pin-macro.rs b/tests/ui/suggestions/suggest-pin-macro.rs
new file mode 100644
index 00000000000..f5b96215925
--- /dev/null
+++ b/tests/ui/suggestions/suggest-pin-macro.rs
@@ -0,0 +1,23 @@
+use std::pin::Pin;
+use std::marker::PhantomPinned;
+
+#[derive(Debug)]
+struct Test {
+    _marker: PhantomPinned,
+}
+impl Test {
+    fn new() -> Self {
+        Test {
+            _marker: PhantomPinned, // This makes our type `!Unpin`
+        }
+    }
+}
+
+fn dummy(_: &mut Test) {}
+
+pub fn main() {
+    let mut test1 = Test::new();
+    let mut test1 = unsafe { Pin::new_unchecked(&mut test1) };
+
+    dummy(test1.get_mut()); //~ ERROR E0277
+}