From c19d6cb6201d86b7fb3cabe33134b1d555881de4 Mon Sep 17 00:00:00 2001
From: def <dennis@felsin9.de>
Date: Fri, 13 Mar 2015 02:17:46 +0100
Subject: [PATCH] Fix infinite recursion in semtypes with recursive types

Fixes #2213
---
 compiler/semtypes.nim | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/compiler/semtypes.nim b/compiler/semtypes.nim
index ac06362114..5e9e584ebb 100644
--- a/compiler/semtypes.nim
+++ b/compiler/semtypes.nim
@@ -787,6 +787,8 @@ proc liftParamType(c: PContext, procKind: TSymKind, genericParams: PNode,
       result = addImplicitGeneric(typ)
     else:
       for i in 0 .. <paramType.sons.len:
+        if paramType.sons[i] == paramType:
+          localError(info, errIllegalRecursionInTypeX, typeToString(paramType))
         var lifted = liftingWalk(paramType.sons[i])
         if lifted != nil:
           paramType.sons[i] = lifted