fixes #206

compiler/patterns.nim

@@ -260,7 +260,7 @@ proc applyRule*(c: PContext, s: PSym, n: PNode): PNode =
     # couldn't bind parameter:
     if isNil(x): return nil
     result.add(x)
-    if requiresAA: addToArgList(args, n)
+    if requiresAA: addToArgList(args, x)
   # perform alias analysis here:
   if requiresAA:
     for i in 1 .. < params.len:

tests/trmacros/tnoalias2.nim

@@ -0,0 +1,19 @@
+discard """
+  output: '''0'''
+"""
+
+# bug #206
+template optimizeOut{testFunc(a, b)}(a: int, b: int{alias}) : expr = 0
+
+proc testFunc(a, b: int): int = result = a + b
+var testVar = 1
+echo testFunc(testVar, testVar)
+
+
+template ex{a = b + c}(a : int{noalias}, b, c : int) =
+  a = b
+  inc a, b
+  echo "came here"
+
+var x = 5
+x = x + x