1 files changed, 79 insertions, 0 deletions
diff --git a/tests/codegen-units/item-collection/unsizing.rs b/tests/codegen-units/item-collection/unsizing.rs
new file mode 100644
index 000000000..111a72312
--- /dev/null
+++ b/tests/codegen-units/item-collection/unsizing.rs
@@ -0,0 +1,79 @@
+// compile-flags:-Zprint-mono-items=eager
+// compile-flags:-Zinline-in-all-cgus
+// compile-flags:-Zmir-opt-level=0
+
+#![deny(dead_code)]
+#![feature(coerce_unsized)]
+#![feature(unsize)]
+#![feature(start)]
+
+use std::marker::Unsize;
+use std::ops::CoerceUnsized;
+
+trait Trait {
+    fn foo(&self);
+}
+
+// Simple Case
+impl Trait for bool {
+    fn foo(&self) {}
+}
+
+impl Trait for char {
+    fn foo(&self) {}
+}
+
+// Struct Field Case
+struct Struct<T: ?Sized> {
+    _a: u32,
+    _b: i32,
+    _c: T
+}
+
+impl Trait for f64 {
+    fn foo(&self) {}
+}
+
+// Custom Coercion Case
+impl Trait for u32 {
+    fn foo(&self) {}
+}
+
+#[derive(Clone, Copy)]
+struct Wrapper<T: ?Sized>(#[allow(unused_tuple_struct_fields)] *const T);
+
+impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<Wrapper<U>> for Wrapper<T> {}
+
+//~ MONO_ITEM fn start
+#[start]
+fn start(_: isize, _: *const *const u8) -> isize {
+    // simple case
+    let bool_sized = &true;
+    //~ MONO_ITEM fn std::ptr::drop_in_place::<bool> - shim(None) @@ unsizing-cgu.0[Internal]
+    //~ MONO_ITEM fn <bool as Trait>::foo
+    let _bool_unsized = bool_sized as &Trait;
+
+    let char_sized = &'a';
+
+    //~ MONO_ITEM fn std::ptr::drop_in_place::<char> - shim(None) @@ unsizing-cgu.0[Internal]
+    //~ MONO_ITEM fn <char as Trait>::foo
+    let _char_unsized = char_sized as &Trait;
+
+    // struct field
+    let struct_sized = &Struct {
+        _a: 1,
+        _b: 2,
+        _c: 3.0f64
+    };
+    //~ MONO_ITEM fn std::ptr::drop_in_place::<f64> - shim(None) @@ unsizing-cgu.0[Internal]
+    //~ MONO_ITEM fn <f64 as Trait>::foo
+    let _struct_unsized = struct_sized as &Struct<Trait>;
+
+    // custom coercion
+    let wrapper_sized = Wrapper(&0u32);
+    //~ MONO_ITEM fn std::ptr::drop_in_place::<u32> - shim(None) @@ unsizing-cgu.0[Internal]
+    //~ MONO_ITEM fn <u32 as Trait>::foo
+    let _wrapper_sized = wrapper_sized as Wrapper<Trait>;
+
+    0
+}