diff --git a/clang/lib/Parse/ParseDeclCXX.cpp b/clang/lib/Parse/ParseDeclCXX.cpp
--- a/clang/lib/Parse/ParseDeclCXX.cpp
+++ b/clang/lib/Parse/ParseDeclCXX.cpp
@@ -4385,7 +4385,7 @@
   llvm::SmallDenseMap<IdentifierInfo*, SourceLocation, 4> SeenAttrs;
 
   bool AttrParsed = false;
-  while (!Tok.isOneOf(tok::r_square, tok::semi)) {
+  while (!Tok.isOneOf(tok::r_square, tok::semi, tok::eof)) {
     if (AttrParsed) {
       // If we parsed an attribute, a comma is required before parsing any
       // additional attributes.
diff --git a/clang/test/Parser/cxx-attributes.cpp b/clang/test/Parser/cxx-attributes.cpp
--- a/clang/test/Parser/cxx-attributes.cpp
+++ b/clang/test/Parser/cxx-attributes.cpp
@@ -42,3 +42,6 @@
 [[,,maybe_unused,]] int Commas4; // ok
 [[foo bar]] int NoComma; // expected-error {{expected ','}} \
                          // expected-warning {{unknown attribute 'foo' ignored}}
+// expected-error@+2 2 {{expected ']'}}
+// expected-error@+1 {{expected external declaration}}
+[[foo