Index: lib/ASTMatchers/Dynamic/Parser.cpp
===================================================================
--- lib/ASTMatchers/Dynamic/Parser.cpp
+++ lib/ASTMatchers/Dynamic/Parser.cpp
@@ -110,6 +110,10 @@
     }
 
     switch (Code[0]) {
+    case '#':
+      Result.Kind = TokenInfo::TK_Eof;
+      Result.Text = "";
+      return Result;
     case ',':
       Result.Kind = TokenInfo::TK_Comma;
       Result.Text = Code.substr(0, 1);
Index: unittests/ASTMatchers/Dynamic/ParserTest.cpp
===================================================================
--- unittests/ASTMatchers/Dynamic/ParserTest.cpp
+++ unittests/ASTMatchers/Dynamic/ParserTest.cpp
@@ -181,6 +181,20 @@
   EXPECT_EQ("Yo!", Foo.BoundID);
 }
 
+TEST(ParserTest, ParseComment) {
+  MockSema Sema;
+  const uint64_t ExpectedFoo = Sema.expectMatcher("Foo");
+  Sema.parse(" Foo() # Bar() ");
+  for (size_t i = 0, e = Sema.Errors.size(); i != e; ++i) {
+    EXPECT_EQ("", Sema.Errors[i]);
+  }
+  EXPECT_EQ(1ULL, Sema.Matchers.size());
+
+  Sema.parse("Foo(#) ");
+
+  EXPECT_EQ("1:4: Error parsing matcher. Found end-of-code while looking for ')'.", Sema.Errors[1]);
+}
+
 using ast_matchers::internal::Matcher;
 
 Parser::NamedValueMap getTestNamedValues() {