Index: clang/lib/Format/TokenAnnotator.cpp
===================================================================
--- clang/lib/Format/TokenAnnotator.cpp
+++ clang/lib/Format/TokenAnnotator.cpp
@@ -2049,6 +2049,10 @@
       Tok = Tok->MatchingParen;
       continue;
     }
+    if (Tok->is(TT_TemplateOpener) && Tok->MatchingParen) {
+      Tok = Tok->MatchingParen;
+      continue;
+    }
     if (Tok->is(tok::kw_const) || Tok->isSimpleTypeSpecifier() ||
         Tok->isOneOf(TT_PointerOrReference, TT_StartOfName, tok::ellipsis))
       return true;
Index: clang/unittests/Format/FormatTest.cpp
===================================================================
--- clang/unittests/Format/FormatTest.cpp
+++ clang/unittests/Format/FormatTest.cpp
@@ -5419,6 +5419,42 @@
                "}\n"
                "template <class T> T *f(T &c);\n", // No break here.
                Style);
+  verifyFormat("int\n"
+               "foo(A<bool> a)\n"
+               "{\n"
+               "  return a;\n"
+               "}\n",
+               Style);
+  verifyFormat("int\n"
+               "foo(A<8> a)\n"
+               "{\n"
+               "  return a;\n"
+               "}\n",
+               Style);
+  verifyFormat("int\n"
+               "foo(A<B<bool>, 8> a)\n"
+               "{\n"
+               "  return a;\n"
+               "}\n",
+               Style);
+  verifyFormat("int\n"
+               "foo(A<B<8>, bool> a)\n"
+               "{\n"
+               "  return a;\n"
+               "}\n",
+               Style);
+  verifyFormat("int\n"
+               "foo(A<B<bool>, bool> a)\n"
+               "{\n"
+               "  return a;\n"
+               "}\n",
+               Style);
+  verifyFormat("int\n"
+               "foo(A<B<8>, 8> a)\n"
+               "{\n"
+               "  return a;\n"
+               "}\n",
+               Style);
 }
 
 TEST_F(FormatTest, AlwaysBreakBeforeMultilineStrings) {