Fix parsing of /**/--> on first line of input.

test/cctest/test-parsing.cc

 // Copyright 2006-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 14 matching lines @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include <stdlib.h>
 
 #include "v8.h"
 
 #include "token.h"
 #include "scanner.h"
 #include "utils.h"
+#include "execution.h"
 
 #include "cctest.h"
 
 namespace i = ::v8::internal;
 
 TEST(KeywordMatcher) {
   struct KeywordToken {
     const char* keyword;
     i::Token::Value token;
   };
@@ skipping 75 matching lines @@
   // If we mark it as failure, continuing won't help.
   i::KeywordMatcher full_stop;
   full_stop.AddChar('i');
   CHECK_EQ(i::Token::IDENTIFIER, full_stop.token());
   full_stop.Fail();
   CHECK_EQ(i::Token::IDENTIFIER, full_stop.token());
   full_stop.AddChar('f');
   CHECK_EQ(i::Token::IDENTIFIER, full_stop.token());
 }
 
+
+TEST(ScanHTMLEndComments) {
+  // Regression test. See:
+  //    http://code.google.com/p/chromium/issues/detail?id=53548
+  // Tests that --> is correctly interpreted as comment-to-end-of-line if there
+  // is only whitespace before it on the line, even after a multiline-comment
+  // comment. This was not the case if it occurred before the first real token
+  // in the input.
+  const char* tests[] = {
+      // Before first real token.
+      "--> is eol-comment\nvar y = 37;\n",
+      "\n --> is eol-comment\nvar y = 37;\n",
+      "/* precomment */ --> is eol-comment\nvar y = 37;\n",
+      "\n/* precomment */ --> is eol-comment\nvar y = 37;\n",
+      // After first real token.
+      "var x = 42;\n--> is eol-comment\nvar y = 37;\n",
+      "var x = 42;\n/* precomment */ --> is eol-comment\nvar y = 37;\n",
+      NULL
+  };
+
+  // Parser needs a stack limit.
+  int marker;
+  i::StackGuard::SetStackLimit(
+      reinterpret_cast<uintptr_t>(&marker) - 128 * 1024);
+
+  for (int i = 0; tests[i]; i++) {
+    v8::ScriptData* data =
+        v8::ScriptData::PreCompile(tests[i], strlen(tests[i]));
+    CHECK(data != NULL && !data->HasError());
+    delete data;
+  }
+}