bugfix: tmacros1.nim works

rod/evals.nim

@@ -303,7 +303,8 @@ proc evalVariable(c: PStackFrame, sym: PSym, flags: TEvalFlags): PNode =
       if result == nil: result = emptyNode
       return
     result = IdNodeTableGet(x.mapping, sym)
-    if not aliasNeeded(result, flags): result = copyTree(result)
+    if result != nil and not aliasNeeded(result, flags): 
+      result = copyTree(result)
     if result != nil: return 
     x = x.next
   result = emptyNode

tests/accept/run/tmacros1.nim

@@ -1,5 +1,5 @@
 discard """
-  output: "hellow"
+  output: "Got: 'nnkIntLit' hi"
 """
 
 import