re PR c++/49482 ([C++0x] unused parameter warning on lambda in function template)

	PR c++/49482
	* semantics.c (maybe_add_lambda_conv_op): Call mark_exp_read for
	static fn parameters.

From-SVN: r175273

gcc/cp/ChangeLog

 2011-06-21  Jason Merrill  <jason@redhat.com>
 
+	PR c++/49482
+	* semantics.c (maybe_add_lambda_conv_op): Call mark_exp_read for
+	static fn parameters.
+
 	* call.c (add_builtin_candidates): Use cv_unqualified rather than
 	TYPE_MAIN_VARIANT.
 	* pt.c (tsubst_arg_types): Likewise.

gcc/cp/semantics.c

@@ -8780,7 +8780,10 @@ maybe_add_lambda_conv_op (tree type)
   argvec = make_tree_vector ();
   VEC_quick_push (tree, argvec, arg);
   for (arg = DECL_ARGUMENTS (statfn); arg; arg = DECL_CHAIN (arg))
-    VEC_safe_push (tree, gc, argvec, arg);
+    {
+      mark_exp_read (arg);
+      VEC_safe_push (tree, gc, argvec, arg);
+    }
   call = build_call_a (callop, VEC_length (tree, argvec),
 		       VEC_address (tree, argvec));
   CALL_FROM_THUNK_P (call) = 1;

gcc/testsuite/ChangeLog

 2011-06-21  Jason Merrill  <jason@redhat.com>
 
+	PR c++/49482
+	* g++.dg/cpp0x/lambda/lambda-warn3.C: New.
+
 	PR c++/49418
 	* g++.dg/template/param3.C: New.
 

gcc/testsuite/g++.dg/cpp0x/lambda/lambda-warn3.C

+// PR c++/49482
+// { dg-options "-std=c++0x -Wunused-but-set-parameter" }
+
+template<class T>
+void f() {
+  []( bool b ){ return b; };
+}
+
+int main()
+{
+  f<int>();
+}