Remove scope from BigUint.opBinary

Author: nordlow

std/internal/math/biguintcore.d

@@ -710,7 +710,7 @@ public:
     // All of these member functions create a new BigUint.
 
     // return x >> y
-    BigUint opBinary(string op, Tulong)(Tulong y) pure nothrow @safe const scope
+    BigUint opBinary(string op, Tulong)(Tulong y) pure nothrow @safe const
         if (op == ">>" && is (Tulong == ulong))
     {
         assert(y > 0, "Can not right shift BigUint by 0");
@@ -719,7 +719,7 @@ public:
         uint words = cast(uint)(y >> LG2BIGDIGITBITS);
         if (bits == 0)
         {
-            return BigUint(data[words..$].idup); // TODO can .idup be avoided?
+            return BigUint(data[words..$]);
         }
         else
         {