Index: include/clang/ASTMatchers/ASTMatchers.h
===================================================================
--- include/clang/ASTMatchers/ASTMatchers.h
+++ include/clang/ASTMatchers/ASTMatchers.h
@@ -1441,6 +1441,11 @@
   Stmt,
   CXXNullPtrLiteralExpr> nullPtrLiteralExpr;
 
+/// \brief Matches GNU __null expression.
+const internal::VariadicDynCastAllOfMatcher<
+  Stmt,
+  GNUNullExpr> gnuNullExpr;
+
 /// \brief Matches binary operator expressions.
 ///
 /// Example matches a || b
Index: unittests/ASTMatchers/ASTMatchersTest.cpp
===================================================================
--- unittests/ASTMatchers/ASTMatchersTest.cpp
+++ unittests/ASTMatchers/ASTMatchersTest.cpp
@@ -2144,6 +2144,10 @@
   EXPECT_TRUE(matches("int* i = nullptr;", nullPtrLiteralExpr()));
 }
 
+TEST(Matcher, GNUNullExpr) {
+  EXPECT_TRUE(matches("int* i = __null;", gnuNullExpr()));
+}
+
 TEST(Matcher, AsmStatement) {
   EXPECT_TRUE(matches("void foo() { __asm(\"mov al, 2\"); }", asmStmt()));
 }