Index: lib/Format/TokenAnnotator.cpp
===================================================================
--- lib/Format/TokenAnnotator.cpp
+++ lib/Format/TokenAnnotator.cpp
@@ -142,8 +142,20 @@
 
     bool StartsObjCMethodExpr = false;
     if (CurrentToken->is(tok::caret)) {
-      // (^ can start a block type.
-      Left->Type = TT_ObjCBlockLParen;
+      const FormatToken *Next = CurrentToken->getNextNonComment();
+      if (Next &&
+          // int (^)(char, float)
+          (Next->startsSequence(tok::r_paren, tok::l_paren) ||
+           // int (^blockReturningIntWithCharAndFloatArguments)(char, float)
+           Next->startsSequence(tok::identifier, tok::r_paren, tok::l_paren) ||
+           // int
+           // (^arrayOfTenBlocksReturningIntWithCharAndFloatArguments[10])(char,
+           // float)
+           Next->startsSequence(tok::identifier, tok::l_square,
+                                tok::numeric_constant, tok::r_square,
+                                tok::r_paren, tok::l_paren))) {
+        Left->Type = TT_ObjCBlockLParen;
+      }
     } else if (FormatToken *MaybeSel = Left->Previous) {
       // @selector( starts a selector.
       if (MaybeSel->isObjCAtKeyword(tok::objc_selector) && MaybeSel->Previous &&
Index: unittests/Format/FormatTest.cpp
===================================================================
--- unittests/Format/FormatTest.cpp
+++ unittests/Format/FormatTest.cpp
@@ -12024,6 +12024,16 @@
           "for (const Foo<Bar>& baz = in.value(); !baz.at_end(); ++baz) {}"));
 }
 
+TEST_F(FormatTest, GuessLanguageWithCaret) {
+  EXPECT_EQ(FormatStyle::LK_Cpp, guessLanguage("foo.h", "FOO(^);"));
+  EXPECT_EQ(FormatStyle::LK_ObjC,
+            guessLanguage("foo.h", "int(^)(char, float);"));
+  EXPECT_EQ(FormatStyle::LK_ObjC,
+            guessLanguage("foo.h", "int(^foo)(char, float);"));
+  EXPECT_EQ(FormatStyle::LK_ObjC,
+            guessLanguage("foo.h", "int(^foo[10])(char, float);"));
+}
+
 } // end namespace
 } // end namespace format
 } // end namespace clang