Patch for LWG issue #2148

[Marshall Clow]

Issue 2148 adds std::hash behavior for enumerations.
Add this support, and a test case.

-- Marshall

Marshall Clow     Idio Software   <mailto:mclow.lists at gmail.com>

A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait).
        -- Yu Suzuki

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