diff --git a/clang/lib/Format/UnwrappedLineFormatter.cpp b/clang/lib/Format/UnwrappedLineFormatter.cpp
--- a/clang/lib/Format/UnwrappedLineFormatter.cpp
+++ b/clang/lib/Format/UnwrappedLineFormatter.cpp
@@ -211,10 +211,11 @@
     const AnnotatedLine *TheLine = *I;
     if (TheLine->Last->is(TT_LineComment))
       return 0;
-    if (I[1]->Type == LT_Invalid || I[1]->First->MustBreakBefore)
+    const auto &NextLine = *I[1];
+    if (NextLine.Type == LT_Invalid || NextLine.First->MustBreakBefore)
       return 0;
     if (TheLine->InPPDirective &&
-        (!I[1]->InPPDirective || I[1]->First->HasUnescapedNewline))
+        (!NextLine.InPPDirective || NextLine.First->HasUnescapedNewline))
       return 0;
 
     if (Style.ColumnLimit > 0 && Indent > Style.ColumnLimit)
@@ -231,13 +232,13 @@
     if (TheLine->Last->is(TT_FunctionLBrace) &&
         TheLine->First == TheLine->Last &&
         !Style.BraceWrapping.SplitEmptyFunction &&
-        I[1]->First->is(tok::r_brace))
+        NextLine.First->is(tok::r_brace))
       return tryMergeSimpleBlock(I, E, Limit);
 
     // Handle empty record blocks where the brace has already been wrapped
     if (TheLine->Last->is(tok::l_brace) && TheLine->First == TheLine->Last &&
         I != AnnotatedLines.begin()) {
-      bool EmptyBlock = I[1]->First->is(tok::r_brace);
+      bool EmptyBlock = NextLine.First->is(tok::r_brace);
 
       const FormatToken *Tok = I[-1]->First;
       if (Tok && Tok->is(tok::comment))
@@ -267,7 +268,7 @@
     bool MergeShortFunctions =
         Style.AllowShortFunctionsOnASingleLine == FormatStyle::SFS_All ||
         (Style.AllowShortFunctionsOnASingleLine >= FormatStyle::SFS_Empty &&
-         I[1]->First->is(tok::r_brace)) ||
+         NextLine.First->is(tok::r_brace)) ||
         (Style.AllowShortFunctionsOnASingleLine & FormatStyle::SFS_InlineOnly &&
          TheLine->Level != 0);
 
@@ -312,48 +313,49 @@
       return MergeShortFunctions ? tryMergeSimpleBlock(I, E, Limit) : 0;
     }
     // Try to merge a control statement block with left brace unwrapped
-    if (TheLine->Last->is(tok::l_brace) && TheLine->First != TheLine->Last &&
+    if (TheLine->Last->is(tok::l_brace) &&
         TheLine->First->isOneOf(tok::kw_if, tok::kw_while, tok::kw_for)) {
       return Style.AllowShortBlocksOnASingleLine != FormatStyle::SBS_Never
                  ? tryMergeSimpleBlock(I, E, Limit)
                  : 0;
     }
     // Try to merge a control statement block with left brace wrapped
-    if (I[1]->First->is(tok::l_brace) &&
-        (TheLine->First->isOneOf(tok::kw_if, tok::kw_else, tok::kw_while,
-                                 tok::kw_for, tok::kw_switch, tok::kw_try,
-                                 tok::kw_do, TT_ForEachMacro) ||
-         (TheLine->First->is(tok::r_brace) && TheLine->First->Next &&
-          TheLine->First->Next->isOneOf(tok::kw_else, tok::kw_catch))) &&
-        Style.BraceWrapping.AfterControlStatement ==
-            FormatStyle::BWACS_MultiLine) {
-      // If possible, merge the next line's wrapped left brace with the current
-      // line. Otherwise, leave it on the next line, as this is a multi-line
-      // control statement.
-      return (Style.ColumnLimit == 0 ||
-              TheLine->Last->TotalLength <= Style.ColumnLimit)
-                 ? 1
-                 : 0;
-    } else if (I[1]->First->is(tok::l_brace) &&
-               TheLine->First->isOneOf(tok::kw_if, tok::kw_else, tok::kw_while,
-                                       tok::kw_for)) {
-      return (Style.BraceWrapping.AfterControlStatement ==
-              FormatStyle::BWACS_Always)
-                 ? tryMergeSimpleBlock(I, E, Limit)
-                 : 0;
-    } else if (I[1]->First->is(tok::l_brace) &&
-               TheLine->First->isOneOf(tok::kw_else, tok::kw_catch) &&
-               Style.BraceWrapping.AfterControlStatement ==
-                   FormatStyle::BWACS_MultiLine) {
-      // This case if different from the upper BWACS_MultiLine processing
-      // in that a preceding r_brace is not on the same line as else/catch
-      // most likely because of BeforeElse/BeforeCatch set to true.
-      // If the line length doesn't fit ColumnLimit, leave l_brace on the
-      // next line to respect the BWACS_MultiLine.
-      return (Style.ColumnLimit == 0 ||
-              TheLine->Last->TotalLength <= Style.ColumnLimit)
-                 ? 1
-                 : 0;
+    if (NextLine.First->is(tok::l_brace)){
+      if ((TheLine->First->isOneOf(tok::kw_if, tok::kw_else, tok::kw_while,
+                                   tok::kw_for, tok::kw_switch, tok::kw_try,
+                                   tok::kw_do, TT_ForEachMacro) ||
+           (TheLine->First->is(tok::r_brace) && TheLine->First->Next &&
+            TheLine->First->Next->isOneOf(tok::kw_else, tok::kw_catch))) &&
+          Style.BraceWrapping.AfterControlStatement ==
+              FormatStyle::BWACS_MultiLine) {
+        // If possible, merge the next line's wrapped left brace with the
+        // current line. Otherwise, leave it on the next line, as this is a
+        // multi-line control statement.
+        return (Style.ColumnLimit == 0 ||
+                TheLine->Last->TotalLength <= Style.ColumnLimit)
+                   ? 1
+                   : 0;
+      }
+      if (TheLine->First->isOneOf(tok::kw_if, tok::kw_else, tok::kw_while,
+                                  tok::kw_for)) {
+        return (Style.BraceWrapping.AfterControlStatement ==
+                FormatStyle::BWACS_Always)
+                   ? tryMergeSimpleBlock(I, E, Limit)
+                   : 0;
+      }
+      if (TheLine->First->isOneOf(tok::kw_else, tok::kw_catch) &&
+          Style.BraceWrapping.AfterControlStatement ==
+              FormatStyle::BWACS_MultiLine) {
+        // This case if different from the upper BWACS_MultiLine processing
+        // in that a preceding r_brace is not on the same line as else/catch
+        // most likely because of BeforeElse/BeforeCatch set to true.
+        // If the line length doesn't fit ColumnLimit, leave l_brace on the
+        // next line to respect the BWACS_MultiLine.
+        return (Style.ColumnLimit == 0 ||
+                TheLine->Last->TotalLength <= Style.ColumnLimit)
+                   ? 1
+                   : 0;
+      }
     }
     // Don't merge block with left brace wrapped after ObjC special blocks
     if (TheLine->First->is(tok::l_brace) && I != AnnotatedLines.begin() &&
@@ -394,15 +396,15 @@
     // Try to merge a block with left brace wrapped that wasn't yet covered
     if (TheLine->Last->is(tok::l_brace)) {
       return !Style.BraceWrapping.AfterFunction ||
-                     (I[1]->First->is(tok::r_brace) &&
+                     (NextLine.First->is(tok::r_brace) &&
                       !Style.BraceWrapping.SplitEmptyRecord)
                  ? tryMergeSimpleBlock(I, E, Limit)
                  : 0;
     }
     // Try to merge a function block with left brace wrapped
-    if (I[1]->First->is(TT_FunctionLBrace) &&
+    if (NextLine.First->is(TT_FunctionLBrace) &&
         Style.BraceWrapping.AfterFunction) {
-      if (I[1]->Last->is(TT_LineComment))
+      if (NextLine.Last->is(TT_LineComment))
         return 0;
 
       // Check for Limit <= 2 to account for the " {".
@@ -413,7 +415,7 @@
       unsigned MergedLines = 0;
       if (MergeShortFunctions ||
           (Style.AllowShortFunctionsOnASingleLine >= FormatStyle::SFS_Empty &&
-           I[1]->First == I[1]->Last && I + 2 != E &&
+           NextLine.First == NextLine.Last && I + 2 != E &&
            I[2]->First->is(tok::r_brace))) {
         MergedLines = tryMergeSimpleBlock(I + 1, E, Limit);
         // If we managed to merge the block, count the function header, which is