Make default state public (#15763)

* Make default state public

* Address review comments

Co-authored-by: b3liever <b3liever@yandex.com>

changelog.md

@@ -7,7 +7,7 @@
 - `prelude` now works with the JavaScript target.
 
 - Added `ioutils` module containing `duplicate` and `duplicateTo` to duplicate `FileHandle` using C function `dup` and `dup2`.
-
+- Added `randState` template that exposes the default random number generator. Useful for library authors.
 
 ## Language changes
 

lib/pure/random.nim

@@ -119,6 +119,12 @@ else:
     a0: 0x69B4C98CB8530805u64,
     a1: 0xFED1DD3004688D67CAu64) # global for backwards compatibility
 
+since (1, 5):
+  template randState*(): untyped =
+    ## Makes the default Rand state accessible from other modules.
+    ## Useful for module authors.
+    state
+
 proc rotl(x, k: Ui): Ui =
   result = (x shl k) or (x shr (Ui(64) - k))