1 files changed, 21 insertions, 0 deletions
diff --git a/build/clang-plugin/NoAutoTypeChecker.cpp b/build/clang-plugin/NoAutoTypeChecker.cpp
new file mode 100644
index 0000000000..937c7c5742
--- /dev/null
+++ b/build/clang-plugin/NoAutoTypeChecker.cpp
@@ -0,0 +1,21 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "NoAutoTypeChecker.h"
+#include "CustomMatchers.h"
+
+void NoAutoTypeChecker::registerMatchers(MatchFinder *AstMatcher) {
+  AstMatcher->addMatcher(varDecl(hasType(autoNonAutoableType())).bind("node"),
+                         this);
+}
+
+void NoAutoTypeChecker::check(const MatchFinder::MatchResult &Result) {
+  const VarDecl *D = Result.Nodes.getNodeAs<VarDecl>("node");
+
+  diag(D->getLocation(), "Cannot use auto to declare a variable of type %0",
+       DiagnosticIDs::Error)
+      << D->getType();
+  diag(D->getLocation(), "Please write out this type explicitly",
+       DiagnosticIDs::Note);
+}