diff --git a/src/object.d b/src/object.d
index fcf1b01e48..6acc09677e 100644
--- a/src/object.d
+++ b/src/object.d
@@ -3491,7 +3491,7 @@ private U[] _dup(T, U)(scope T[] a) pure nothrow @trusted if (__traits(isPOD, T)
     return *cast(U[]*) &arr;
 }
 
-private U[] _dupCtfe(T, U)(T[] a)
+private U[] _dupCtfe(T, U)(scope T[] a)
 {
     static if (is(T : void))
         assert(0, "Cannot dup a void[] array at compile time.");
@@ -3524,6 +3524,21 @@ private U[] _dup(T, U)(T[] a) if (!__traits(isPOD, T))
     return res;
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=22107
+@safe unittest
+{
+    static int i;
+    @safe struct S
+    {
+        this(this) { i++; }
+    }
+
+    void fun(scope S[] values...) @safe
+    {
+        values.dup;
+    }
+}
+
 // HACK:  This is a lie.  `_d_arraysetcapacity` is neither `nothrow` nor `pure`, but this lie is
 // necessary for now to prevent breaking code.
 private extern (C) size_t _d_arraysetcapacity(const TypeInfo ti, size_t newcapacity, void[]* arrptr) pure nothrow;