clang-format: [JS] Properly add a space after "in" in for loops.

llvm-svn: 253672
diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index 751b070..171ecc4 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -1955,7 +1955,8 @@
         Left.isOneOf(Keywords.kw_returns, Keywords.kw_option))
       return true;
   } else if (Style.Language == FormatStyle::LK_JavaScript) {
-    if (Left.isOneOf(Keywords.kw_let, Keywords.kw_var, TT_JsFatArrow))
+    if (Left.isOneOf(Keywords.kw_let, Keywords.kw_var, TT_JsFatArrow,
+                     Keywords.kw_in))
       return true;
     if (Right.isOneOf(TT_JsTypeColon, TT_JsTypeOptionalQuestion))
       return false;
diff --git a/clang/unittests/Format/FormatTestJS.cpp b/clang/unittests/Format/FormatTestJS.cpp
index 9be3752..56a9144 100644
--- a/clang/unittests/Format/FormatTestJS.cpp
+++ b/clang/unittests/Format/FormatTestJS.cpp
@@ -545,6 +545,11 @@
                "}");
 }
 
+TEST_F(FormatTestJS, ForLoops) {
+  verifyFormat("for (var i in [2, 3]) {\n"
+               "}");
+}
+
 TEST_F(FormatTestJS, AutomaticSemicolonInsertion) {
   // The following statements must not wrap, as otherwise the program meaning
   // would change due to automatic semicolon insertion.