https://bugzilla.redhat.com/show_bug.cgi?id=631158
http://sourceware.org/ml/gdb-patches/2010-09/msg00229.html
Subject: [patch] PR 11992 "Regression: C++ this scope sometimes does not work"

--- gdb-7.2/gdb/c-exp.y.orig	2010-08-19 17:50:00.000000000 +0200
+++ gdb-7.2/gdb/c-exp.y	2010-09-11 20:30:15.000000000 +0200
@@ -2422,6 +2422,7 @@ classify_name (struct block *block)
 
   if (sym == NULL
       && parse_language->la_language == language_cplus
+      && !is_a_field_of_this
       && !lookup_minimal_symbol (copy, NULL, NULL))
     return UNKNOWN_CPP_NAME;