I think N3276 (Decltype and Call Expressions) is implemented in r151117.
Boost.Config needs a config macro to determine the support of this feature,
but clang does not have such a macro.

This patch adds a new config macro
    __has_feature(cxx_decltype_incomplete_return_type)
and updates doc and test.
(I'm willing to change the macro name to better one.)

Regards,
Michel

Attachment: cxx_decltype_incomplete_return_type.patch
Description: Binary data

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