Implement support for -Wunused-variable, from Oscar Bonilla!


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@83577 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/SemaCXX/warn-unused-variables.cpp b/test/SemaCXX/warn-unused-variables.cpp
new file mode 100644
index 0000000..d8b9a00
--- /dev/null
+++ b/test/SemaCXX/warn-unused-variables.cpp
@@ -0,0 +1,6 @@
+// RUN: clang -fsyntax-only -Wunused-variable -verify %s
+
+template<typename T> void f() {
+	T t;
+	t = 17;
+}