[PATCH] clang-format: Support @autoreleasepool.

[strager]

Hi djasper,

Format @autoreleasepool properly for the Attach brace style
by recognizing @autoreleasepool as a block introducer.

http://reviews.llvm.org/D10372

Files:
  lib/Format/UnwrappedLineParser.cpp
  unittests/Format/FormatTest.cpp

Index: lib/Format/UnwrappedLineParser.cpp
===================================================================
--- lib/Format/UnwrappedLineParser.cpp
+++ lib/Format/UnwrappedLineParser.cpp
@@ -657,6 +657,16 @@
       nextToken();
       addUnwrappedLine();
       return;
+    case tok::objc_autoreleasepool:
+      nextToken();
+      if (FormatTok->Tok.is(tok::l_brace)) {
+        if (Style.BreakBeforeBraces == FormatStyle::BS_Allman ||
+            Style.BreakBeforeBraces == FormatStyle::BS_GNU)
+          addUnwrappedLine();
+        parseBlock(/*MustBeDeclaration=*/false);
+      }
+      addUnwrappedLine();
+      return;
     case tok::objc_synchronized:
       nextToken();
       if (FormatTok->Tok.is(tok::l_paren))

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