Index: cfe/trunk/lib/Format/Format.cpp
===================================================================
--- cfe/trunk/lib/Format/Format.cpp
+++ cfe/trunk/lib/Format/Format.cpp
@@ -1024,6 +1024,7 @@
         cleanupLeft(Line->First, tok::comma, tok::r_paren);
         cleanupLeft(Line->First, TT_CtorInitializerComma, tok::l_brace);
         cleanupLeft(Line->First, TT_CtorInitializerColon, tok::l_brace);
+        cleanupLeft(Line->First, TT_CtorInitializerColon, tok::equal);
       }
     }
 
Index: cfe/trunk/lib/Format/TokenAnnotator.cpp
===================================================================
--- cfe/trunk/lib/Format/TokenAnnotator.cpp
+++ cfe/trunk/lib/Format/TokenAnnotator.cpp
@@ -520,7 +520,8 @@
         Tok->Type = TT_BitFieldColon;
       } else if (Contexts.size() == 1 &&
                  !Line.First->isOneOf(tok::kw_enum, tok::kw_case)) {
-        if (Tok->Previous->isOneOf(tok::r_paren, tok::kw_noexcept))
+        if (Tok->getPreviousNonComment()->isOneOf(tok::r_paren,
+                                                  tok::kw_noexcept))
           Tok->Type = TT_CtorInitializerColon;
         else
           Tok->Type = TT_InheritanceColon;
Index: cfe/trunk/unittests/Format/CleanupTest.cpp
===================================================================
--- cfe/trunk/unittests/Format/CleanupTest.cpp
+++ cfe/trunk/unittests/Format/CleanupTest.cpp
@@ -151,6 +151,16 @@
   EXPECT_EQ(Expected, cleanupAroundOffsets({15}, Code));
 }
 
+TEST_F(CleanupTest, CtorInitializationSimpleRedundantColon) {
+  std::string Code = "class A {\nA() : =default; };";
+  std::string Expected = "class A {\nA()  =default; };";
+  EXPECT_EQ(Expected, cleanupAroundOffsets({15}, Code));
+
+  Code = "class A {\nA() : , =default; };";
+  Expected = "class A {\nA()  =default; };";
+  EXPECT_EQ(Expected, cleanupAroundOffsets({15}, Code));
+}
+
 TEST_F(CleanupTest, ListRedundantComma) {
   std::string Code = "void f() { std::vector<int> v = {1,2,,,3,{4,5}}; }";
   std::string Expected = "void f() { std::vector<int> v = {1,2,3,{4,5}}; }";
@@ -239,6 +249,14 @@
   Code = "class A {\nA() : , // comment\n y(1),{} };";
   Expected = "class A {\nA() :  // comment\n y(1){} };";
   EXPECT_EQ(Expected, cleanupAroundOffsets({17}, Code));
+
+  Code = "class A {\nA() // comment\n : ,,{} };";
+  Expected = "class A {\nA() // comment\n {} };";
+  EXPECT_EQ(Expected, cleanupAroundOffsets({30}, Code));
+
+  Code = "class A {\nA() // comment\n : ,,=default; };";
+  Expected = "class A {\nA() // comment\n =default; };";
+  EXPECT_EQ(Expected, cleanupAroundOffsets({30}, Code));
 }
 
 TEST_F(CleanupTest, CtorInitializerInNamespace) {