Index: clang-tidy/bugprone/InaccurateEraseCheck.cpp
===================================================================
--- clang-tidy/bugprone/InaccurateEraseCheck.cpp
+++ clang-tidy/bugprone/InaccurateEraseCheck.cpp
@@ -17,10 +17,6 @@
 namespace tidy {
 namespace bugprone {
 
-namespace {
-AST_MATCHER(Decl, isInStdNamespace) { return Node.isInStdNamespace(); }
-}
-
 void InaccurateEraseCheck::registerMatchers(MatchFinder *Finder) {
   // Only register the matchers for C++; the functionality currently does not
   // provide any benefit to other languages, despite being benign.