Index: clang/lib/Format/UnwrappedLineParser.cpp
===================================================================
--- clang/lib/Format/UnwrappedLineParser.cpp
+++ clang/lib/Format/UnwrappedLineParser.cpp
@@ -3080,7 +3080,8 @@
       }
       if (FormatTok->is(tok::l_square)) {
         FormatToken *Previous = FormatTok->Previous;
-        if (!Previous || Previous->isNot(tok::r_paren)) {
+        if (!Previous || (Previous->isNot(tok::r_paren) &&
+                          !Previous->isTypeOrIdentifier())) {
           // Don't try parsing a lambda if we had a closing parenthesis before,
           // it was probably a pointer to an array: int (*)[].
           if (!tryToParseLambda())
Index: clang/unittests/Format/FormatTest.cpp
===================================================================
--- clang/unittests/Format/FormatTest.cpp
+++ clang/unittests/Format/FormatTest.cpp
@@ -23638,6 +23638,7 @@
   verifyFormat("struct Y<[] { return 0; }> {};", Style);
 
   verifyFormat("struct Z : X<decltype([] { return 0; }){}> {};", Style);
+  verifyFormat("template <int N> struct Foo<char[N]> {};", Style);
 }
 
 TEST_F(FormatTest, RemoveBraces) {