Why Can't I Get the bool Value from a value_type Returned by decltype?, C++ (vc++)

Why Can't I Get the bool Value from a value_type Returned by decltype?

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Compilation time: 1,55 sec, absolute service time: 1,59 sec

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Error(s):

source_file.cpp(11): error C2146: syntax error: missing '>' before identifier 'value'
source_file.cpp(12): note: see reference to class template instantiation 'bar<T>' being compiled
source_file.cpp(11): error C2993: 'unknown-type': illegal type for non-type template parameter '_Test'
Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x64

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