Add test for ICE

src/test/ui/traits/trait-with-dst.rs

@@ -0,0 +1,22 @@
+// compile-pass
+// #55266
+
+struct VTable<DST: ?Sized> {
+    _to_dst_ptr: fn(*mut ()) -> *mut DST,
+}
+
+trait HasVTableFor<DST: ?Sized + 'static> {
+    const VTABLE: &'static VTable<DST>;
+}
+
+impl<T, DST: ?Sized + 'static> HasVTableFor<DST> for T {
+    const VTABLE: &'static VTable<DST> = &VTable {
+        _to_dst_ptr: |_: *mut ()| unsafe { std::mem::zeroed() },
+    };
+}
+
+pub fn push<DST: ?Sized + 'static, T>() {
+    <T as HasVTableFor<DST>>::VTABLE;
+}
+
+fn main() {}