From 3998ca512f85580b18b2feea6743389b596e072a Mon Sep 17 00:00:00 2001
From: Laurent Sansonetti <lrz@chopine.be>
Date: Fri, 27 May 2011 15:36:06 -0700
Subject: [PATCH] don't crash when messaging methodSignatureForSelector: to
 NSProxy class or instance

---
 objc.m | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/objc.m b/objc.m
index e71087b23..a7b243b83 100644
--- a/objc.m
+++ b/objc.m
@@ -103,7 +103,14 @@
 rb_objc_supports_forwarding(VALUE recv, SEL sel)
 {
     if (!SPECIAL_CONST_P(recv)) {
-	return [(id)recv methodSignatureForSelector:sel] != nil;
+	@try {
+	    // Protect the call since it may throw an exception when called on
+	    // NSProxy class or instance.
+	    return [(id)recv methodSignatureForSelector:sel] != nil;
+	}
+	@catch (id exc) {
+	    return false;
+	}
     }
     return false;
 }