From 06feaef64a2bb4fbff50091b2f15cb0736c849d3 Mon Sep 17 00:00:00 2001
From: Araq <rumpf_a@web.de>
Date: Sat, 11 Apr 2015 02:54:20 +0200
Subject: [PATCH] fixes #1658

---
 compiler/semtypes.nim      |  2 +-
 tests/objects/tobjloop.nim | 15 +++++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)
 create mode 100644 tests/objects/tobjloop.nim

diff --git a/compiler/semtypes.nim b/compiler/semtypes.nim
index 664d54221c..4a45da2f9e 100644
--- a/compiler/semtypes.nim
+++ b/compiler/semtypes.nim
@@ -789,7 +789,7 @@ proc liftParamType(c: PContext, procKind: TSymKind, genericParams: PNode,
                                   @[newTypeS(paramType.kind, c)])
       result = addImplicitGeneric(typ)
     else:
-      for i in 0 .. <paramType.sons.len:
+      for i in 0 .. <paramType.len:
         if paramType.sons[i] == paramType:
           globalError(info, errIllegalRecursionInTypeX, typeToString(paramType))
         var lifted = liftingWalk(paramType.sons[i])
diff --git a/tests/objects/tobjloop.nim b/tests/objects/tobjloop.nim
new file mode 100644
index 0000000000..9fea1e2fb9
--- /dev/null
+++ b/tests/objects/tobjloop.nim
@@ -0,0 +1,15 @@
+discard """
+  output: "is Nil false"
+"""
+# bug #1658
+
+type
+  Loop* = ref object
+    onBeforeSelect*: proc (L: Loop)
+
+var L: Loop
+new L
+L.onBeforeSelect = proc (bar: Loop) =
+  echo "is Nil ", bar.isNil
+
+L.onBeforeSelect(L)