fixes #933

compiler/vm.nim

@@ -671,14 +671,11 @@ proc rawExecute(c: PCtx, start: int, tos: PStackFrame): TFullReg =
     of opcLtu:
       decodeBC(rkInt)
       regs[ra].intVal = ord(regs[rb].intVal <% regs[rc].intVal)
-    of opcEqRef:
+    of opcEqRef, opcEqNimrodNode:
       decodeBC(rkInt)
       regs[ra].intVal = ord((regs[rb].node.kind == nkNilLit and
                              regs[rc].node.kind == nkNilLit) or
                              regs[rb].node == regs[rc].node)
-    of opcEqNimrodNode:
-      decodeBC(rkInt)
-      regs[ra].intVal = ord(regs[rb].node == regs[rc].node)
     of opcXor:
       decodeBC(rkInt)
       regs[ra].intVal = ord(regs[rb].intVal != regs[rc].intVal)

tests/macros/tbug1149.nim

@@ -6,7 +6,10 @@ f
 TTaa
 TTaa
 TTaa
-TTaa'''
+TTaa
+true
+true
+nil'''
 
 output: '''test'''
 """
@@ -62,3 +65,16 @@ macro m(s:static[Td]) : stmt =
 const s=("TT", 3)
 m(s)
 m(s)
+
+# bug #933
+
+proc nilcheck(): PNimrodNode {.compileTime.} =
+  echo(result == nil) # true
+  echo(result.isNil) # true
+  echo(repr(result)) # nil
+
+macro testnilcheck(): stmt =
+  result = newNimNode(nnkStmtList)
+  discard nilcheck()
+
+testnilcheck()