fix test

lib/pure/random.nim

@@ -343,19 +343,13 @@ proc rand*[T: SomeInteger](t: typedesc[T]): T =
   ## * `rand proc<#rand,float>`_ that returns a floating point number
   ## * `rand proc<#rand,HSlice[T: Ordinal or float or float32 or float64,T: Ordinal or float or float32 or float64]>`_
   ##   that accepts a slice
-  runnableExamples("-r:off"):
+  runnableExamples:
     randomize(567)
-    # implementation defined
-    assert rand(int8) == 55
-    assert rand(int8) == -42
-    assert rand(int8) == 43
-    assert rand(uint32) == 578980729'u32
-    assert rand(uint32) == 4052940463'u32
-    assert rand(uint32) == 2163872389'u32
-    assert rand(range[1..16]) == 11
-    assert rand(range[1..16]) == 4
-    assert rand(range[1..16]) == 16
-
+    if false: # implementation defined
+      assert rand(int8) == -42
+      assert rand(uint32) == 578980729'u32
+      assert rand(range[1..16]) == 11
+  # pending csources >= 1.4.0, use `runnableExamples("-r:off")` instead (a strang error)
   when T is range:
     result = rand(state, low(T)..high(T))
   else: