C++ PATCH for c++/48523 (lamda, 'this', templates)

[Jason Merrill <jason@redhat.com>]

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Our rewriting for use of 'this' in a lambda used cp_build_indirect_ref, 
which assumes that we aren't in a template.  Using build_x_indirect_ref 
instead works better.

Tested x86_64-pc-linux-gnu, applying to trunk and 4.6.

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commit 9b7a53bda8938ff42074b1f38a3e0b68cb37e52e
Author: Jason Merrill <jason@redhat.com>
Date:   Sat Apr 9 01:40:20 2011 -0400

    	PR c++/48523
    	* tree.c (maybe_dummy_object): Use build_x_indirect_ref rather
    	than cp_build_indirect_ref.

diff --git a/gcc/cp/tree.c b/gcc/cp/tree.c
index d6b6197..ad004bb 100644
--- a/gcc/cp/tree.c
+++ b/gcc/cp/tree.c
@@ -2423,7 +2423,7 @@ maybe_dummy_object (tree type, tree* binfop)
   else if (current != current_class_type
 	   && context == nonlambda_method_basetype ())
     /* In a lambda, need to go through 'this' capture.  */
-    decl = (cp_build_indirect_ref
+    decl = (build_x_indirect_ref
 	    ((lambda_expr_this_capture
 	      (CLASSTYPE_LAMBDA_EXPR (current_class_type))),
 	     RO_NULL, tf_warning_or_error));
diff --git a/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-this4.C b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-this4.C
new file mode 100644
index 0000000..29cd2a9
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-this4.C
@@ -0,0 +1,13 @@
+// PR c++/48523
+// { dg-options -std=c++0x }
+
+template<typename>
+struct X
+{
+  bool b;
+
+  void f()
+  {
+    [this]{ return b; };
+  }
+};