6 files changed, 48 insertions, 36 deletions
diff --git a/lib/pure/collections/lists.nim b/lib/pure/collections/lists.nim
index adfd9ceb4..ad8eca6a9 100755
--- a/lib/pure/collections/lists.nim
+++ b/lib/pure/collections/lists.nim
@@ -11,6 +11,9 @@
 ## to do so, the 'next' and 'prev' pointers are not hidden from you and can
 ## be manipulated directly for efficiency.
 
+when not defined(nimhygiene):
+  {.pragma: dirty.}
+
 type
   TDoublyLinkedNode* {.pure, 
       final.}[T] = object ## a node a doubly linked list consists of
@@ -62,13 +65,13 @@ proc newSinglyLinkedNode*[T](value: T): PSinglyLinkedNode[T] =
   new(result)
   result.value = value
 
-template itemsListImpl() =
+template itemsListImpl() {.dirty.} =
   var it = L.head
   while it != nil:
     yield it.value
     it = it.next
 
-template itemsRingImpl() =
+template itemsRingImpl() {.dirty.} =
   var it = L.head
   if it != nil:
     while true:
@@ -76,14 +79,14 @@ template itemsRingImpl() =
       it = it.next
       if it == L.head: break
 
-template nodesListImpl() =
+template nodesListImpl() {.dirty.} =
   var it = L.head
   while it != nil:
     var nxt = it.next
     yield it
     it = nxt
 
-template nodesRingImpl() =
+template nodesRingImpl() {.dirty.} =
   var it = L.head
   if it != nil:
     while true:
@@ -92,7 +95,7 @@ template nodesRingImpl() =
       it = nxt
       if it == L.head: break
 
-template findImpl() =
+template findImpl() {.dirty.} =
   for x in nodes(L):
     if x.value == value: return x
 
@@ -132,7 +135,7 @@ iterator nodes*[T](L: TDoublyLinkedRing[T]): PDoublyLinkedNode[T] =
   ## list during traversal is supported.
   nodesRingImpl()
 
-template dollarImpl() =
+template dollarImpl() {.dirty.} =
   result = "["
   for x in nodes(L):
     if result.len > 1: result.add(", ")
diff --git a/lib/pure/collections/sequtils.nim b/lib/pure/collections/sequtils.nim
index 9e39bff62..82679bb7f 100644
--- a/lib/pure/collections/sequtils.nim
+++ b/lib/pure/collections/sequtils.nim
@@ -15,6 +15,9 @@
 ## **Note**: This interface will change as soon as the compiler supports
 ## closures and proper coroutines.
 
+when not defined(nimhygiene):
+  {.pragma: dirty.}
+
 proc concat*[T](seqs: varargs[seq[T]]): seq[T] =
   ## Takes several sequences' items and returns them inside of one sequence.
   var L = 0
@@ -50,7 +53,7 @@ proc filter*[T](seq1: seq[T], pred: proc(item: T): bool {.closure.}): seq[T] =
   ## Returns all items in a sequence that fulfilled the predicate.
   accumulateResult(filter(seq1, pred))
 
-template filterIt*(seq1, pred: expr): expr {.immediate.} =
+template filterIt*(seq1, pred: expr): expr {.immediate, dirty.} =
   ## Finds a specific item in a sequence as long as the 
   ## predicate returns true. The predicate needs to be an expression
   ## containing ``it``: ``filterIt("abcxyz", it == 'x')``.
diff --git a/lib/pure/collections/sets.nim b/lib/pure/collections/sets.nim
index f65239b83..ff2ffec0e 100755
--- a/lib/pure/collections/sets.nim
+++ b/lib/pure/collections/sets.nim
@@ -16,6 +16,8 @@ import
   os, hashes, math
 
 {.pragma: myShallow.}
+when not defined(nimhygiene):
+  {.pragma: dirty.}
 
 type
   TSlotEnum = enum seEmpty, seFilled, seDeleted
@@ -48,7 +50,7 @@ proc mustRehash(length, counter: int): bool {.inline.} =
 proc nextTry(h, maxHash: THash): THash {.inline.} =
   result = ((5 * h) + 1) and maxHash
 
-template rawGetImpl() =
+template rawGetImpl() {.dirty.} =
   var h: THash = hash(key) and high(s.data) # start with real hash value
   while s.data[h].slot != seEmpty:
     if s.data[h].key == key and s.data[h].slot == seFilled:
@@ -56,7 +58,7 @@ template rawGetImpl() =
     h = nextTry(h, high(s.data))
   result = -1
 
-template rawInsertImpl() =
+template rawInsertImpl() {.dirty.} =
   var h: THash = hash(key) and high(data)
   while data[h].slot == seFilled:
     h = nextTry(h, high(data))
@@ -81,14 +83,14 @@ proc Enlarge[A](s: var TSet[A]) =
     if s.data[i].slot == seFilled: RawInsert(s, n, s.data[i].key)
   swap(s.data, n)
 
-template inclImpl() =
+template inclImpl() {.dirty.} =
   var index = RawGet(s, key)
   if index < 0:
     if mustRehash(len(s.data), s.counter): Enlarge(s)
     RawInsert(s, s.data, key)
     inc(s.counter)
 
-template containsOrInclImpl() =
+template containsOrInclImpl() {.dirty.} =
   var index = RawGet(s, key)
   if index >= 0:
     result = true
@@ -125,7 +127,7 @@ proc toSet*[A](keys: openarray[A]): TSet[A] =
   result = initSet[A](nextPowerOfTwo(keys.len+10))
   for key in items(keys): result.incl(key)
 
-template dollarImpl(): stmt =
+template dollarImpl(): stmt {.dirty.} =
   result = "{"
   for key in items(s):
     if result.len > 1: result.add(", ")
@@ -155,7 +157,7 @@ proc card*[A](s: TOrderedSet[A]): int {.inline.} =
   ## alias for `len`.
   result = s.counter
 
-template forAllOrderedPairs(yieldStmt: stmt) =
+template forAllOrderedPairs(yieldStmt: stmt) {.dirty.} =
   var h = s.first
   while h >= 0:
     var nxt = s.data[h].next
diff --git a/lib/pure/collections/tables.nim b/lib/pure/collections/tables.nim
index 81466bb15..3ae25d3ad 100755
--- a/lib/pure/collections/tables.nim
+++ b/lib/pure/collections/tables.nim
@@ -26,6 +26,9 @@ type
     data: TKeyValuePairSeq[A, B]
     counter: int
 
+when not defined(nimhygiene):
+  {.pragma: dirty.}
+
 proc len*[A, B](t: TTable[A, B]): int =
   ## returns the number of keys in `t`.
   result = t.counter
@@ -66,7 +69,7 @@ proc mustRehash(length, counter: int): bool {.inline.} =
 proc nextTry(h, maxHash: THash): THash {.inline.} =
   result = ((5 * h) + 1) and maxHash
 
-template rawGetImpl() =
+template rawGetImpl() {.dirty.} =
   var h: THash = hash(key) and high(t.data) # start with real hash value
   while t.data[h].slot != seEmpty:
     if t.data[h].key == key and t.data[h].slot == seFilled:
@@ -74,7 +77,7 @@ template rawGetImpl() =
     h = nextTry(h, high(t.data))
   result = -1
 
-template rawInsertImpl() =
+template rawInsertImpl() {.dirty.} =
   var h: THash = hash(key) and high(data)
   while data[h].slot == seFilled:
     h = nextTry(h, high(data))
@@ -115,12 +118,12 @@ proc Enlarge[A, B](t: var TTable[A, B]) =
     if t.data[i].slot == seFilled: RawInsert(t, n, t.data[i].key, t.data[i].val)
   swap(t.data, n)
 
-template AddImpl() =
+template AddImpl() {.dirty.} =
   if mustRehash(len(t.data), t.counter): Enlarge(t)
   RawInsert(t, t.data, key, val)
   inc(t.counter)
 
-template PutImpl() =
+template PutImpl() {.dirty.} =
   var index = RawGet(t, key)
   if index >= 0:
     t.data[index].val = val
@@ -129,7 +132,7 @@ template PutImpl() =
 
 when false:
   # not yet used:
-  template HasKeyOrPutImpl() =
+  template HasKeyOrPutImpl() {.dirty.} =
     var index = RawGet(t, key)
     if index >= 0:
       t.data[index].val = val
@@ -168,7 +171,7 @@ proc toTable*[A, B](pairs: openarray[tuple[key: A,
   result = initTable[A, B](nextPowerOfTwo(pairs.len+10))
   for key, val in items(pairs): result[key] = val
 
-template dollarImpl(): stmt =
+template dollarImpl(): stmt {.dirty.} =
   if t.len == 0:
     result = "{:}"
   else:
@@ -199,7 +202,7 @@ proc len*[A, B](t: TOrderedTable[A, B]): int {.inline.} =
   ## returns the number of keys in `t`.
   result = t.counter
 
-template forAllOrderedPairs(yieldStmt: stmt) =
+template forAllOrderedPairs(yieldStmt: stmt) {.dirty.} =
   var h = t.first
   while h >= 0:
     var nxt = t.data[h].next
diff --git a/lib/pure/unittest.nim b/lib/pure/unittest.nim
index 5220f53e0..3a52cb916 100644
--- a/lib/pure/unittest.nim
+++ b/lib/pure/unittest.nim
@@ -31,19 +31,19 @@ var
   
   checkpoints: seq[string] = @[]
 
-template TestSetupIMPL*: stmt = nil
-template TestTeardownIMPL*: stmt = nil
+template TestSetupIMPL*: stmt {.dirty.} = nil
+template TestTeardownIMPL*: stmt {.dirty.} = nil
 
 proc shouldRun(testName: string): bool =
   result = true
 
-template suite*(name: expr, body: stmt): stmt =
+template suite*(name: expr, body: stmt): stmt {.dirty.} =
   block:
-    template setup*(setupBody: stmt): stmt =
-      template TestSetupIMPL: stmt = setupBody
+    template setup*(setupBody: stmt): stmt {.dirty.} =
+      template TestSetupIMPL: stmt {.dirty.} = setupBody
 
-    template teardown*(teardownBody: stmt): stmt =
-      template TestTeardownIMPL: stmt = teardownBody
+    template teardown*(teardownBody: stmt): stmt {.dirty.} =
+      template TestTeardownIMPL: stmt {.dirty.} = teardownBody
 
     body
 
@@ -59,12 +59,12 @@ proc testDone(name: string, s: TTestStatus) =
     else:
       echo "[", $s, "] ", name, "\n"
   
-template test*(name: expr, body: stmt): stmt =
+template test*(name: expr, body: stmt): stmt {.dirty.} =
   bind shouldRun, checkpoints, testDone
 
   if shouldRun(name):
     checkpoints = @[]
-    var TestStatusIMPL = OK
+    var TestStatusIMPL {.inject.} = OK
     
     try:
       TestSetupIMPL()
@@ -146,13 +146,14 @@ macro check*(conditions: stmt): stmt =
     var ast = conditions.treeRepr
     error conditions.lineinfo & ": Malformed check statement:\n" & ast
 
-template require*(conditions: stmt): stmt =
+template require*(conditions: stmt): stmt {.dirty.} =
   block:
-    const AbortOnError = true    
+    const AbortOnError {.inject.} = true
     check conditions
 
 macro expect*(exp: stmt): stmt =
-  template expectBody(errorTypes, lineInfoLit: expr, body: stmt): PNimrodNode =
+  template expectBody(errorTypes, lineInfoLit: expr,
+                      body: stmt): PNimrodNode {.dirty.} =
     try:
       body
       checkpoint(lineInfoLit & ": Expect Failed, no exception was thrown.")
diff --git a/lib/system.nim b/lib/system.nim
index 6d1f14e2e..01b85a4d6 100755
--- a/lib/system.nim
+++ b/lib/system.nim
@@ -1259,8 +1259,8 @@ proc max*[T](x: varargs[T]): T =
 
 proc clamp*[T](x, a, b: T): T =
   ## limits the value ``x`` within the interval [a, b] 
-  if x > a: return a
-  if x < b: return b
+  if x < a: return a
+  if x > b: return b
   return x
 
 iterator items*[T](a: openarray[T]): T {.inline.} =
@@ -1657,9 +1657,9 @@ proc echo*[T](x: varargs[T, `$`]) {.magic: "Echo", noSideEffect.}
   ## side effects, so that it can be used for debugging routines marked as
   ## ``noSideEffect``.
 
-template newException*(exceptn: typeDesc, message: string): expr = 
+template newException*(exceptn: typeDesc, message: string): expr =
   ## creates an exception object of type ``exceptn`` and sets its ``msg`` field
-  ## to `message`. Returns the new exception object. 
+  ## to `message`. Returns the new exception object.
   # block: # open a new scope
   var
     e: ref exceptn