fixed #96 as good as technically possible (debug frames are allocated on the C stack)

lib/pure/algorithm.nim

@@ -35,12 +35,12 @@ proc reverse*[T](a: var openArray[T]) =
   reverse(a, 0, a.high)
 
 const
-  onlySafeCode = true
+  onlySafeCode = false
 
 proc merge[T](a, b: var openArray[T], lo, m, hi: int, 
               cmp: proc (x, y: T): int, order: TSortOrder) =
   template `<-` (a, b: expr) = 
-    when true:
+    when false:
       a = b
     elif onlySafeCode:
       shallowCopy(a, b)

lib/system.nim

@@ -2129,16 +2129,16 @@ template assert*(cond: expr, msg = "") =
   ## Use ``assert`` for debugging purposes only.
   bind raiseAssert, InstantiationInfo
   when compileOption("assertions"):
-    if not cond:
-      {.line.}:
+    {.line.}:
+      if not cond:
         raiseAssert(astToStr(cond) & ' ' & msg)
 
 template doAssert*(cond: expr, msg = "") =
   ## same as `assert` but is always turned on and not affected by the
   ## ``--assertions`` command line switch.
   bind raiseAssert, InstantiationInfo
-  if not cond:
-    {.line: InstantiationInfo().}:
+  {.line: InstantiationInfo().}:
+    if not cond:
       raiseAssert(astToStr(cond) & ' ' & msg)