remove a temporary variable in int128.nim (#16935)

compiler/int128.nim

@@ -1,9 +1,9 @@
 ## This module is for compiler internal use only. For reliable error
 ## messages and range checks, the compiler needs a data type that can
-## hold all from ``low(BiggestInt)`` to ``high(BiggestUInt)``, This
+## hold all from `low(BiggestInt)` to `high(BiggestUInt)`, This
 ## type is for that purpose.
 
-from math import trunc
+from std/math import trunc
 
 type
   Int128* = object
@@ -176,7 +176,6 @@ proc toHex*(arg: Int128): string =
   result.addToHex(arg)
 
 proc inc*(a: var Int128, y: uint32 = 1) =
-  let input = a
   a.udata[0] += y
   if unlikely(a.udata[0] < y):
     a.udata[1].inc
@@ -379,7 +378,7 @@ proc `*`*(lhs,rhs: Int128): Int128 =
 proc `*=`*(a: var Int128, b: Int128) =
   a = a * b
 
-import bitops
+import std/bitops
 
 proc fastLog2*(a: Int128): int =
   if a.udata[3] != 0: