COMPILE_ASSERT problem

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What steps will reproduce the problem?
Compile using MSVC 2013

What is the expected output? What do you see instead?
Compilation failed!

What version of the product are you using? On what operating system?

Windows 7(64) + MSVC 2013


Please provide any additional information below.

Compile error:

btree.h(1401) : error C2118: Negative subscript
That is the 

COMPILE_ASSERT(
      sizeof(key_compare_checker(key_compare_helper()(key_type(), key_type()))) ==
      sizeof(big_),
      key_comparison_function_must_return_bool);

Original issue reported on code.google.com by [email protected] on 22 Dec 2013 at 3:49