clang-format: Fix incorrect lambda recognition exposed by r203452.

Before:
  int i = a[a][a] -> f();

After:
  int i = a[a][a]->f();

llvm-svn: 203556

clang/lib/Format/UnwrappedLineParser.cpp

@@ -758,7 +758,8 @@ bool UnwrappedLineParser::tryToParseLambda() {
   // FIXME: This is a dirty way to access the previous token. Find a better
   // solution.
   if (!Line->Tokens.empty() &&
-      (Line->Tokens.back().Tok->isOneOf(tok::identifier, tok::kw_operator) ||
+      (Line->Tokens.back().Tok->isOneOf(tok::identifier, tok::kw_operator,
+                                        tok::r_square) ||
        Line->Tokens.back().Tok->isSimpleTypeSpecifier())) {
     nextToken();
     return false;

clang/unittests/Format/FormatTest.cpp

@@ -7980,6 +7980,7 @@ TEST_F(FormatTest, FormatsLambdas) {
   verifyFormat("double &operator[](int i) { return 0; }\n"
                "int i;");
   verifyFormat("std::unique_ptr<int[]> foo() {}");
+  verifyFormat("int i = a[a][a]->f();");
 
   // Other corner cases.
   verifyFormat("void f() {\n"