[bugfix] hashes: fix regression for nested containers (#11426)

Move forward declarations earlier.

lib/pure/hashes.nim

@@ -149,6 +149,12 @@ proc hash*(x: float): Hash {.inline.} =
   var y = x + 1.0
   result = cast[ptr Hash](addr(y))[]
 
+
+# Forward declarations before methods that hash containers. This allows
+# containers to contain other containers
+proc hash*[A](x: openArray[A]): Hash
+proc hash*[A](x: set[A]): Hash
+
 template bytewiseHashing(result: Hash, x: typed, start, stop: int) =
   for i in start .. stop:
     result = result !& hash(x[i])
@@ -292,12 +298,6 @@ proc hashIgnoreCase*(sBuf: string, sPos, ePos: int): Hash =
   result = !$h
 
 
-# Forward declarations before methods that hash containers. This allows
-# containers to contain other containers
-proc hash*[A](x: openArray[A]): Hash
-proc hash*[A](x: set[A]): Hash
-
-
 proc hash*[T: tuple](x: T): Hash =
   ## Efficient hashing of tuples.
   for f in fields(x):