Index: lib/Format/UnwrappedLineParser.cpp
===================================================================
--- lib/Format/UnwrappedLineParser.cpp
+++ lib/Format/UnwrappedLineParser.cpp
@@ -370,7 +370,9 @@
                                 Keywords.kw_as)) ||
               NextTok->isOneOf(tok::comma, tok::period, tok::colon,
                                tok::r_paren, tok::r_square, tok::l_brace,
-                               tok::l_square, tok::l_paren, tok::ellipsis) ||
+                               tok::l_square, tok::ellipsis) ||
+              (Style.Language == FormatStyle::LK_Cpp &&
+               NextTok->is(tok::l_paren)) ||
               (NextTok->is(tok::identifier) &&
                !PrevTok->isOneOf(tok::semi, tok::r_brace, tok::l_brace)) ||
               (NextTok->is(tok::semi) &&
Index: unittests/Format/FormatTestJS.cpp
===================================================================
--- unittests/Format/FormatTestJS.cpp
+++ unittests/Format/FormatTestJS.cpp
@@ -451,6 +451,16 @@
                "  inner2(a, b);\n"
                "}");
   verifyFormat("function f() {}");
+  verifyFormat("function aFunction() {}\n"
+               "(function f() {\n"
+               "  var x = 1;\n"
+               "}());\n");
+  // Known issue: this should wrap after {}, but calculateBraceTypes
+  // misclassifies the first braces as a BK_BracedInit.
+  verifyFormat("function aFunction(){} {\n"
+               "  let x = 1;\n"
+               "  console.log(x);\n"
+               "}\n");
 }
 
 TEST_F(FormatTestJS, GeneratorFunctions) {