Breakpoint position should be inside function body.

test/cctest/test-debug.cc

 // Copyright 2007-2008 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 1157 matching lines @@
 
   // Run without breakpoints.
   foo->Call(env->Global(), 0, NULL);
   CHECK_EQ(0, break_point_hit_count);
 
   // Run with breakpoint
   int bp = SetBreakPoint(foo, 0);
   foo->Call(env->Global(), 0, NULL);
   CHECK_EQ(1, break_point_hit_count);
   CHECK_EQ(0, last_source_line);
-  CHECK_EQ(16, last_source_column);
+  CHECK_EQ(15, last_source_column);
   foo->Call(env->Global(), 0, NULL);
   CHECK_EQ(2, break_point_hit_count);
   CHECK_EQ(0, last_source_line);
-  CHECK_EQ(16, last_source_column);
+  CHECK_EQ(15, last_source_column);
 
   // Run without breakpoints.
   ClearBreakPoint(bp);
   foo->Call(env->Global(), 0, NULL);
   CHECK_EQ(2, break_point_hit_count);
 
   v8::Debug::SetDebugEventListener(NULL);
   CheckDebuggerUnloaded();
 }
 
@@ skipping 5516 matching lines @@
 
   CHECK_EQ(2, TestClientData::constructor_call_counter);
   CHECK_EQ(TestClientData::constructor_call_counter,
            TestClientData::destructor_call_counter);
 
   v8::Debug::SetDebugEventListener(NULL);
   CheckDebuggerUnloaded();
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT