[boost] mpl/test/set_c.cpp mystery

Subject: [boost] mpl/test/set_c.cpp mystery
From: Peter Dimov (lists_at_[hidden])
Date: 2014-06-04 11:47:53

mpl/test/set_c.cpp has been failing for all my toolsets (in both master and 
develop) with the same error,

In file included from ..\..\../boost/mpl/set/aux_/begin_end_impl.hpp:19:0,
                 from ..\..\../boost/mpl/set/set0.hpp:29,
                 from ..\..\../boost/mpl/set/set0_c.hpp:18,
                 from ..\..\../boost/mpl/set/set10_c.hpp:19,
                 from ..\..\../boost/mpl/set/set20_c.hpp:19,
                 from ..\..\../boost/mpl/set_c.hpp:36,
                 from set_c.cpp:14:

..\..\../boost/mpl/set/aux_/iterator.hpp:57:1: error: no type named `base` 
in `struct boost::mpl::set0_c<bool>`

The regression report is all green though, so it was a bit of a mystery.

Turned out that I needed to run "b2 headers". So there is an MPL header that 
b2 misses, although I don't have time at the moment to identify which one. 
But I decided to report the experience anyway, in case someone runs into the 
same problem. :-)