Clean out (#15440)

changelog.md

@@ -156,7 +156,7 @@
   Proc `rightSize` for Tables and HashSets is deprecated, as it is not needed anymore.
   `CountTable.inc` takes `val: int` again not `val: Positive`; I.e. it can "count down" again.
 - Removed deprecated symbols from `macros` module, deprecated as far back as `0.15`.
-
+- Removed `sugar.distinctBase`, deprecated since `0.19`.
 - Export `asyncdispatch.PDispatcher.handles` so that an external library can register them.
 
 - Added `deques.toDeque`, which creates a deque from an openArray. The usage is

lib/pure/sugar.nim

@@ -186,10 +186,6 @@ proc freshIdentNodes(ast: NimNode): NimNode =
         result.add inspect(child)
   result = inspect(ast)
 
-template distinctBase*(T: typedesc): typedesc {.deprecated: "use distinctBase from typetraits instead".} =
-  ## reverses ``type T = distinct A``; works recursively.
-  typetraits.distinctBase(T)
-
 macro capture*(locals: varargs[typed], body: untyped): untyped {.since: (1, 1).} =
   ## Useful when creating a closure in a loop to capture some local loop variables
   ## by their current iteration values. Example: