[boost] [Spirit Karma] Mutable references formed by pass_container in Karma "repeat" tests

Subject: [boost] [Spirit Karma] Mutable references formed by pass_container in Karma "repeat" tests
From: Doug Gregor (doug.gregor_at_[hidden])
Date: 2011-05-04 14:29:02

There are a few Karma failures using the latest Clang due to the
pass_container detail class forming mutable references:

  http://www.boost.org/development/tests/release/developer/output/dgregor2-boost-bin-v2-libs-spirit-test-karma_repeat1-p2-test-clang-darwin-3-0-debug-karma.html

I know that at least some compilers (e.g., GCC) don't diagnose mutable
references, but this code is ill-formed account to the standard.
Someone want to take a shot at eliminating or factoring out the
mutability to avoid these mutable references?

  - Doug