r261248 - [analyzer] Include comment mistakenly left out of r261243. NFC.

[Devin Coughlin via cfe-commits]

Author: dcoughlin
Date: Thu Feb 18 13:37:39 2016
New Revision: 261248

URL: http://llvm.org/viewvc/llvm-project?rev=261248&view=rev
Log:
[analyzer] Include comment mistakenly left out of r261243. NFC.

It explains why we can't just synthesize bodies of setters in BodyFarm.

Modified:
    cfe/trunk/lib/Analysis/BodyFarm.cpp

Modified: cfe/trunk/lib/Analysis/BodyFarm.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Analysis/BodyFarm.cpp?rev=261248&r1=261247&r2=261248&view=diff
==============================================================================
--- cfe/trunk/lib/Analysis/BodyFarm.cpp (original)
+++ cfe/trunk/lib/Analysis/BodyFarm.cpp Thu Feb 18 13:37:39 2016
@@ -498,6 +498,14 @@ Stmt *BodyFarm::getBody(const ObjCMethod
     return nullptr;
 
   // For now, we only synthesize getters.
+  // Synthesizing setters would cause false negatives in the
+  // RetainCountChecker because the method body would bind the parameter
+  // to an instance variable, causing it to escape. This would prevent
+  // warning in the following common scenario:
+  //
+  //  id foo = [[NSObject alloc] init];
+  //  self.foo = foo; // We should warn that foo leaks here.
+  //
   if (D->param_size() != 0)
     return nullptr;